Properties of Quadrilaterals

A quadrilateral is a polygon with four sides, four vertices, and four angles.

1. Opposite sides are equal in length. 2. All angles are right angles (90 degrees). 3. Diagonals are equal in length.

A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length.

All rectangles are parallelograms, but not all parallelograms are rectangles.

A rhombus is a quadrilateral with all four sides of equal length.

A square is a rectangle with all sides of equal length, while a rectangle has opposite sides equal.

1. All sides are equal in length. 2. Opposite angles are equal. 3. Diagonals bisect each other at right angles.

Congruent angles are angles that have the same measure.

The sum of the interior angles of a quadrilateral is 360 degrees.

A trapezoid is a quadrilateral with at least one pair of parallel sides.