Understanding Quadrilateral Theorems

Front

Definition of Quadrilateral

Back

A four-sided polygon with four angles.

Front

Sum of Interior Angles

Back

360°

Front

Parallelogram

Back

Opposite sides are parallel and equal.

Front

Rectangle

Back

Opposite sides are equal, all angles 90°.

Front

Rhombus

Back

All sides equal, opposite angles equal.

Front

Square

Back

All sides equal, all angles 90°.

Front

Trapezoid

Back

Only one pair of parallel sides.

Front

Kite

Back

Two pairs of adjacent sides equal.

Front

Diagonals of a Parallelogram

Back

Bisect each other.

Front

Diagonals of a Rhombus

Back

Perpendicular bisectors of each other.