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Definition: Parallelogram is a quadrilateral in which opposite sides are parallel. Interactivity 1 - Play with a Parallelogram Упатсво за интерактивноста Click and drag the slider buttons to change the size. Click and drag point B to move and point А to rotate. |
| Basic formulas for a parallelogram with sides a and b and height h: perimeter is: L=2(a+b) , and area is: A=ah .
Examples for perimeter and area of parallelograms Check the following examples using the above interactivity. Notice that the length of "side" b does not affect the area and the height h does not affect the perimeter.
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Interactivity 2: Construct a parallelogram
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Equivalent definitions:
Theorems
(This together with 4 above means that a quadrilateral is a parallelogram if and only if the diagonals bisect each other.)
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Related themes:
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