Introduction to parallelogram — lesson. Mathematics State Board, Class 7.

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A parallelogram is a flat shape with four sides in which opposite sides parallel and equal in length.

Where

$|$ and

$||$ denotes equal sides.

Properties of parallelogram:

Opposite sides are parallel.
Opposite sides are equal in length.
Opposite angles are . (Angles $A$ and $D$ are same and angles $B$ and $C$ are same.)
Angles " $A$ " and " $C$ " or " $B$ " and " $D$ " add up to $180°$ so that they are . (For example, Two angles ( $140°$ and $40°$ ) are supplementary angles because they add up to $180°$ ).
Adjacent angles are supplementary in parallelogram.

Important!

For example: A parallelogram became a rectangle where all angles are right angles.

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1. Introduction to parallelogram