Definition: Parallelogram is a quadrilateral in which opposite sides are parallel. Interactivity 1  Play with a Parallelogram Directions for interactivity 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.

Interactivity 2: Construct a parallelogram Watch Mathcast

Equivalent definitions:
Theorems
(This together with 4 above means that a quadrilateral is a parallelogram if and only if the diagonals bisect each other.)

Related themes:
Metadata
Global  Parallelogram 
Brief  Mathcasts and Interactivities to understand and practice the parallelogram. 
Grade  710 Interactivities start at 7th grade level on up 
Strand  Geometry and Measurement 
Standards  CA 7MG.2.1, CA GEO.10, ACTnone 
Keywords  parallelogram, quadrilateral, quadrangle, construct, geogebra, area, perimeter 
Comments  none 
Download  
Author  LFS  contact  website 
Type  Freeware  Available for Offline and Online Use  Translatable (html) 
Use  Requires sunJava player 
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