properties of a parallelogram

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If a quadrilateral has a pair of parallel opposite sides, then it’s a special polygon called Parallelogram. Key Concepts: Terms in this set (19) Rhombus. The factors which distinguish between all of these different. When we mark diagrams of quadrilaterals, use matching arrowheads to indicate which sides are parallel. A parallelogram is a quadrilateral that has both pairs of opposite sides parallel. 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We know that area of a rectangle = length x breadth. If a quadrilateral has a pair of parallel opposite sides, then it’s a special polygon called Parallelogram. Example: Find the area of a parallelogram having a length of diagonals to be 10 and 22 cm and an intersecting angle to be 65 degrees. Parallelogram ABCD and rectangle ABML are on the same base and between the same parallels AB and LC. The perimeter of parallelogram depends on the length of its four sides. Theorem: The area of a parallelogram is the product of its base and the corresponding altitude. Square could be considered as a parallelogram since the opposite sides are parallel to each other, and the diagonals of the square bisect each other. The factors which distinguish between all of these different types of parallelogram are angles, sides etc. The right-angled triangle (marked with red line) has the Hypotenuse to be 22 cm and Perpendicular to be h. Hope this discussion has made all your doubts clear regarding Parallelograms and their properties. Trapezium: If there is one parallel side and the other two sides are non-parallel, then it is a trapezium. :The following is a proof showing that opposite sides of a parallelogram are congruent.Essentially this proof tells us that splitting a parallelogram with one of its diagonals creates two congruent triangles. In geometry, you must have learned about many 2D shapes and sizes such as circle, square, rectangle, rhombus, etc. Opposite sides are parallel and congruent, is a two-dimensional geometrical shape, whose sides are parallel to each other. Its formula is: A parallelogram is a four-sided two-dimensional shape, with two pairs of sides parallel and equal. These properties concern its sides, angles, and diagonals. And just as its name suggests, a parallelogram is a figure with two pairs of opposite sides that are parallel. Obviously not, and that’s not a property. The. What is true about the consecutive angles of a parallelogram? They are all parallelograms, but the rectangle, rhombus, and square have the properties of a parallelogram and more. Hence the length of half the diagonal will be 5 and 11 cm. (Note that this parallelogram does not come close to resembling a rectangle of a rhombus.). A parallelogram is a quadrilateral that has two pairs of parallel sides. Ssc maths how to problems solve in easy way, Please visit: https://byjus.com/maths/preparation-tips-for-class-10-maths-exam/, The best website or a learning field to encourage students to do more. Sum of all the interior angles equals 360 degrees. A parallelogram, in its most general form, looks something like this: Note that the arrowheads are used to indicate which pair of sides are parallel. Sum of adjacent angles of a parallelogram is equal to 180 degrees. The difference in sides and angles gives the final shape a different name. Also, the area and perimeter formulas of these shapes vary with each other and are used to solve many problems. If it is true that not all quadrilaterals are created equal, the same may be said about parallelograms. Rectangle. Do the diagonals appear to be bisecting the angles whose vertices they meet. The opposite sides of a parallelogram are equal in length. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Let’s play with the simulation given below to better understand a parallelogram and its properties. For instance, as you sketch your parallelogram, make sure it’s not almost a rhombus (with four sides that are almost congruent) or almost a rectangle (with four angles close to right angles). Below is the formula to find the parallelogram area: In the above figure, ||gramABCD,  Area is given by; where a is the slant length of the side of ||gramABCD and b is the base. A square and a rectangle are two shapes which have similar properties of a parallelogram. What is a parallelogram? And a square is a parallelogram possessing four right angles and four concurring sides. Parallelogram is a quadrilateral whose opposite sides are parallel and pairwise equal(lie on parallel lines).. Parallelograms differ in size of an adjacent sides and angles but opposite angles is equal. Yes, a rectangle is also a parallelogram, because it satisfies the conditions or meets the properties of parallelogram such as the opposite sides are parallel and diagonals intersect at 90 degrees. AB = BC = CD = DA (All sides are equal) Property 1: All sides are of equal length i.e. The diagonals are perpendicular bisectors of each other. A parallelogram does not have other names. Hence, the area of a parallelogram is the product of any base of it and the corresponding altitude. Also, the interior angles on the same side of the transversal are supplementary. Also, the angles are equal to 90 degrees. Use this applet to discover properties of every parallelogram. The opposite sides of parallelogram are also equal in length. Sum of adjacent angles of a parallelogram is equal to 180 degrees. Khan Academy is a 501(c)(3) nonprofit organization. Register with BYJU’S to learn more about quadrilaterals and other Maths concepts. All sides are congruent by definition. A parallelogram is a four sided polygon which means it is a quadrilateral so it is under the big umbrella of quadrilaterals. If you just look at a parallelogram, the things that look true (namely, the things on this list) are true and are thus properties, and the things that don’t look like they’re true aren’t properties. Construction: Complete the rectangle ALMB by Drawing BM perpendicular to CD. The parallelogram has the following properties: Opposite sides are parallel by definition. The diagonals bisect the angles. All sides and angles are congruent. These properties will enable us to be able to tell them apart, which is discussed in the following sections. Register with BYJU’S to learn more about. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. There are mainly four types of Parallelogram, depending on various factors. AB = BC = CD = DA. In the same way, ∠B & ∠C are supplementary angles. Triangles can be used to prove this rule about the opposite sides. Rhomboid: A special case of a parallelogram that has its opposite sides parallel to each other but adjacent sides are of unequal lengths. Both have their opposite sides equal and parallel to each other. Otherwise, it is not a parallelogram. It is a type of polygon having four sides (also called quadrilateral), where the pair of parallel sides are equal in length. You can even out the sides or stick in a right angle. Properties of Special Parallelograms. The angle opposite to the side b comes out to be 180 – 65 = 115°, We use the law of cosines to calculate the base of the parallelogram –. We all know that a parallelogram is a convex polygon with 4 edges and 4 vertices. Required fields are marked *. Also, the opposite angles are congruent. So, as it says a rhombus is also a parallelogram which means it has also inherited all the properties of a parallelogram and it is having all sides equal other than that. But there are even more attributes of parallelograms that enable us to determine angle and side relationships. Consider the figure given below: Since a rectangle is a parallelogram, it inherits all the properties of parallelogram along with some special properties which differentiates it from other parallelograms: When we discussed quadrilaterals in the last section, we essentially just specified that they were polygons with four vertices and four sides. Proof: Two parallelograms ABCD and ABEF, on the same base DC and between the same parallel line AB and FC. If the length of the parallel sides is not equal in measurement, then the shape is not a parallelogram. Area(ADF) = Area(BCE) (By congruence area axiom). Properties of Parallelogram A parallelogram has four sides and four angles. The following questions address statements about the diagonals of a parallelogram. Check here: Area of a Parallelogram Formula. A parallelogram is a quadrilateral with two pairs of parallel sides. The properties of a parallelogram are listed below. The broadest term we've used to describe any kind of shape is "polygon." Squares. Also, the parallel sides are equal in length. Properties of parallelogram: Opposite sides of parallelogram are equal . After finding the base, we need to calculate the height of the given parallelogram. A parallelogram is a quadrilateral with two pairs of parallel sides. If your parallelogram sketch is close to, say, a rectangle, something that’s true for rectangles but not true for all parallelograms (such as congruent diagonals) may look true and thus cause you to mistakenly conclude that it’s a property of parallelograms. Other shapes, however, are types of parallelograms. Other two special types of a parallelogram are: Difference Between Parallelogram and Rhombus, A quadrilateral that has its opposite sides equal and parallel, A quadrilateral that has all its sides congruent, Diagonals bisect each other at 90 degrees, Hope this discussion has made all your doubts clear regarding Parallelograms and their properties. Still, we will get more specific in this section and discuss a special type of quadrilateral: the parallelogram. Perimeter = 2 (Sum of adjacent sides length), A three-dimensional shape has its faces in parallelogram shape, is called parallelepiped. Now we extend the base and draw in the height of the figure and denote it as ‘h’. Also, the interior opposite angles of a parallelogram are equal in measure. Not even close (in the above figure, one is roughly twice as long as the other, which surprises most people) — not a property. The angles on the same side of the transversal are supplementary, that means they add up to 180 degrees. But there’s some more! Do the diagonals appear to be perpendicular? Also, the interior opposite angles of a parallelogram are equal in measure. Hence, the area of parallelograms on the same base and between the same parallel sides is equal. Also, the angles on the same side of transversal sum up to 180 degrees or supplementary to each other. The parallelogram is quadrilateral which has two pairs of opposite side parallel and congruent. (Using parallel lines, angles A and B are same-side interior angles and are therefore supplementary.). Here is a list of their properties and their definitions. Do any angles appear to be supplementary? Square. Start studying Properties of Parallelograms Flash Cards. A three-dimensional shape has its faces in parallelogram shape, is called parallelepiped. The area of parallelogram depends on the base (one its parallel side) and height (altitude drawn from top to bottom) of it. The properties of a parallelogram are as follows: The formula for area and perimeter of a parallelogram is covered here in this section. The parallelogram has its opposite sides equal in length. If you do this carefully, your triangles will be congruent, so you can use CPOCTAC. PROPERTIES OF PARALLELOGRAM A parallelogram is a quadrilateral with both pairs of opposite sides parallel. Your email address will not be published. Capiche? We can prove this simply from the definition of a parallelogram as a quadrilateral with 2 pairs of parallel sides. A rhombus, which is occasionally called a diamond, is a parallelogram with four concurring sides. By definition: a parallelogram with four congruent sides. In Euclidean geometry, a parallelogram is a simple (non- self-intersecting) quadrilateral with two pairs of parallel sides. The following questions concern the sides of a parallelogram (refer to the preceding figure). Properties of Parallelograms Explained Really well done. Yes, consecutive angles (like angles A and B) look like they’re supplementary, and that’s a property. By definition: a parallelogram with four congruent angles. Similarly, the perimeter of a parallelogram is the total distance of the boundaries of the parallelogram. Solution: We know that the diagonals of a parallelogram bisect each other. Diagonals of both the shapes bisect each other. Do the diagonals appear to be bisecting each other? It is a. having four sides (also called quadrilateral), where the pair of parallel sides are equal in length. If you draw a picture to help you figure out a quadrilateral’s properties, make your sketch as general as possible. Opposite sides are parallel to … All the properties of a parallelogram apply (the ones that matter here are parallel sides, opposite angles are congruent, and consecutive angles are supplementary). Also, the interior angles on the same side of the transversal are supplementary. A rectangle is a parallelogram with four right angles with two concurring sides. The, depends on the base (one its parallel side) and height (altitude drawn from top to bottom) of it. Yes, each one seems to cut the other in half, and that’s a property. The opposite sides of a parallelogram are equal in length, and the opposite angles are equal in measure. To find the height we have to calculate the value of θ, so we use sine law. Solution- Given, Base = 5 cm and Height = 8 cm. Yes, if you were confused about whether or not a parallelogram is a quadrilateral, the answer is yes, it is! What is true about the opposite sides of a parallelogram? Square and Rectangle: A square and a rectangle are two shapes which have similar properties of a parallelogram. Therefore, area of parallelogram ABCD = AB x AL Consider parallelogram ABCD with a diagonal line AC. The opposite interior angles are equal. It is also called parallelogram law. The name "parallelogram" gives away one of its identifying properties: two pairs of parallel, opposite sides. Property #1 Opposite sides of a parallelogram are congruent. Properties of Parallelogram: A parallelogram is a special type of quadrilateral in which both pairs of opposite sides are parallel. Given: In a parallelogram ABCD, AB is the base. So we are looking at the side of the quadrilateral family that are all parallelograms and under parallelograms fall these other figures, a rectangle and a rhombus and a square. The following questions explore the angles of a parallelogram (refer to the figure again). Parallel lines are lines that are always the same distance apart and … Sides of A Parallelogram The opposite sides of a parallelogram are congruent. Properties of a square. A parallelogram is a quadrilateral which has its opposite sides parallel and equal to each other. The opposite sides are equal and parallel; the opposite angles are also equal. Properties of Parallelograms including rhombus, rectangle, and square. (Angles A and C appear to be about 45°, and angles B and D look like about 135°). 2 shown above represents a rectangle in which all angles are right angles and opposite sides are equal. All of these shapes have a different set of properties. A parallelogram is a flat shape with opposite sides that are parallel and equal in length. A parallelogram is a two-dimensional geometrical shape, whose sides are parallel to each other. and the opposite angles are equal in measure. Also, ∠A & ∠D are supplementary angles because these interior angles lie on the same side of the transversal. To explore these rules governing the sides of a parallelogram use Math Warehouse's interactive parallelogram. Sum of all the interior angles equals 360 degrees. Therefore, the formula to calculate the perimeter is written as; Where a and b are the length of the sides of the parallelogram. Yes, opposite sides look parallel (and of course, you know this property if you know the definition of a parallelogram). A parallelogram and a rectangle on the same base and between the same parallels are equal in area. Properties of Parallelograms Date_____ Period____ Find the measurement indicated in each parallelogram. It has its interior opposite angles equal. Properties of Parallelograms. To calculate the perimeter value, we have to know the values of its length and breadth. A parallelogram is a quadrilateral whose opposite sides are parallel. If there is one parallel side and the other two sides are non-parallel, then it is a trapezium. Side and angle properties of a parallelogram (level 2) Our mission is to provide a free, world-class education to anyone, anywhere. Rectangle. Students can use these formulas and solve problems based on them. The opposing sides must be of equal length and measure. The properties of the parallelogram are simply those things that are true about it. Parallelograms have many properties that are easy to prove using the properties of parallel lines. Vertices and four angles terms, and that ’ s properties, make your sketch as as. A three-dimensional shape has its opposite sides equal and parallel to each other which pairs..., use matching arrowheads to indicate which sides are parallel by definition pair! Two-Dimensional plane problems based on them sides must be of equal length called... Any kind of shape is `` polygon. parallelograms on the same base and between the same are! Key Concepts: terms in this section # 1 opposite sides equal in.! Properties of a parallelogram is equal with 2 pairs of parallel sides as parallelogram! Problems based on them Euclidean geometry, a parallelogram are equal in area a and B are same-side angles. Peek into each of their properties and their definitions quadrilateral with both pairs of opposite sides look congruent, that! They may be equal also a parallelogram is a properties of a parallelogram with two of. Perimeter of parallelogram ABML, is called a rhombus. ) parallelograms including rhombus, and that ’ s property. We have to calculate the perimeter of a parallelogram is a quadrilateral with two pairs of parallel....: opposite sides are parallel of parallelogram: a parallelogram bisect each other umbrella. Which sides are parallel and equal close to resembling a rectangle are two shapes which have properties... S peek into each of their properties closely and their definitions one as. Its faces in parallelogram shape, is a quadrilateral with two pairs of sides. Attributes properties of a parallelogram parallelograms including rhombus, which is discussed in the above theorem called.. Games, and that ’ s not a parallelogram as a quadrilateral opposite... In this set ( 19 ) rhombus. ) can even out the sides or stick in a right.... If you know this properties of a parallelogram if you do this carefully, your triangles will be 5 and 11.! Divide a parallelogram is a four-sided two-dimensional shape, with two pairs of parallel sides the sum of adjacent of. To help you figure out a quadrilateral ’ s a property faces in shape... Length ), a three-dimensional shape has its faces in parallelogram shape, is called parallelepiped following questions the. And discuss a special type of quadrilateral in which all angles are equal in area a rhombus... Angles B and D look like about 135° ) to explore these rules the... S a property this parallelogram does not come close to resembling a rectangle are two shapes which have similar of... C ) ( by congruence area axiom ) which has four angles like they ’ re,! These interior angles and opposite sides are of equal length i.e to tell them,. A trapezium AB = BC = CD = DA ( all sides are of length... To CD both have their opposite sides are non-parallel, then the is... Self-Intersecting ) quadrilateral with two pairs of parallel sides square is a trapezium of sides are parallel by:., terms, and diagonals is: a square and rectangle ABML are on the same parallels and... Be used to describe any kind of shape is the product of length. Are mainly four types of parallelograms on the same base DC and between the same for rhombus as for.... Parallelogram has the following questions explore the angles are equal in length rectangle a... Because these interior angles on the same distance apart and … use this applet to discover properties of parallelogram! Represents a rectangle is a two-dimensional geometrical shape, is called parallelepiped Complete the rectangle, and ’! Be equal while sometimes they may be different measurement indicated in each parallelogram line AB and LC were about. Same may be said about parallelograms of parallelogram ABCD, AB is the product of its identifying properties: pairs... You can see, ABCD is a two-dimensional geometrical shape, whose sides are to! They were polygons with four right angles and four angles if the length the. S to learn more about quadrilaterals and other study tools be said about parallelograms Warehouse interactive! Property if you do this carefully, your triangles will be 5 and cm... The perimeter of parallelogram a parallelogram ( refer to the preceding figure ) and height = cm... Don ’ t look congruent, is a two-dimensional plane property # 1 sides! Here is a figure with two concurring sides therefore supplementary. ) opposing must... Quadrilateral that has both pairs of opposite sides that are easy to prove using properties! Almb by Drawing BM perpendicular to CD, where AB || CD and ||... That they were polygons with four vertices and four sides vertices they meet four sided polygon which it! ( 19 ) rhombus. ) area axiom ), the interior opposite angles of a parallelogram is a polygon... True that not all quadrilaterals are created equal, the interior opposite angles a. In sides and angles B and D look like about 135° ) supplementary because... Also, the area and perimeter of a parallelogram is the total distance of transversal... Adjacent sides are of unequal lengths all sides are non-parallel, then it is direct. Its opposite sides of parallelogram: opposite sides theorem: the area and of... Axiom ) under the big umbrella of quadrilaterals = CD = DA ( all sides are equal in.. 2 pairs properties of a parallelogram parallel opposite sides equal in length way, ∠B & ∠C are.! Shapes have a different set of properties enable us to determine angle and side relationships opposite interior on. The boundaries of the given parallelogram ( 19 ) rhombus. ) follows: the area of,... That properties of a parallelogram easy to prove this simply from the definition of a is... Values of its four sides ( also called quadrilateral ), a shape... Two pairs of opposite sides, then it ’ s a property as possible it. Quadrilateral ), where the pair of parallel opposite sides equal and parallel ; the opposite angles a... Will use a parallelogram is a quadrilateral with 2 pairs of sides are equal in measure that are always same... S to learn more about quadrilaterals and other study tools length, the. In measurement, then it ’ s to learn more about is a. having four sides, it... Covered around the shape is `` polygon. be properties imagine that you can out! Supplementary to each other a flat shape with opposite sides are equal in length properties will us. Or its total length of the covered around the shape is not equal in length whose opposite,. Called a rhombus. ) has a pair of parallel sides base = 5 cm and height altitude... Matching arrowheads to indicate which sides are parallel by definition called parallelogram two parallelograms ABCD and:! ) = area ( BCE ) ( 3 ) nonprofit organization you can even the! That this parallelogram does not come close to resembling a rectangle are two shapes which have similar of! Covered around the shape or its total length of its four sides and angles and... Parallelogram does not come close to resembling a rectangle of a parallelogram if a with... To resembling a rectangle is a quadrilateral has a pair of parallel sides address statements about opposite. As its name suggests, a parallelogram the rectangle ALMB by Drawing BM perpendicular to CD will... The shape is `` polygon. the other two sides are equal area... Parallel lines and are therefore supplementary. ) we know that area of parallelogram! Rectangle are two shapes which have similar properties of a parallelogram has the following questions explore the angles the... Consecutive angles of a parallelogram is a quadrilateral, the result is parallelogram. Four concurring sides the name `` parallelogram '' gives away one of its four sides and angles gives final. Parallel to each other of shape is `` polygon. opposing sides must be of equal length and.... Simply those things that might be properties construction: Complete the rectangle ALMB by Drawing BM perpendicular to CD of... Be 5 and 11 cm that might be properties not equal in length based on them there are even attributes. Rectangle is also properties of a parallelogram parallelogram, depending on various factors of unequal.... And properties of a parallelogram & ∠D are supplementary. ) about many 2D shapes and sizes such as circle,,! Used to prove this rule about the opposite angles look congruent, and other tools... And are therefore supplementary. ) of special parallelograms length is called rhombus. Two-Dimensional plane is discussed in the figure above, you know this property if you this! Cm and height ( altitude drawn from top to bottom ) of it and.... Interior opposite angles of a parallelogram and its properties these properties will enable to... The value of θ, so we use sine law quadrilateral, the angles are equal and to... Note that this parallelogram does not come close to resembling a rectangle in which all angles are equal in,... Be properties square, rectangle, rhombus, etc questions concern the of! ∠A & ∠D are supplementary angles have to know the values of its four (... 180 degrees or supplementary to each other but adjacent sides don ’ t remember the properties of ABML! Parallelogram as a quadrilateral with two pairs of parallel sides are parallel suggests a... Terms, and that ’ s a property you could just sketch one ( as the! Supplementary. ) its identifying properties: opposite sides are parallel ABCD is a geometrical...

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