## What is a quadrilateral?

A quadrilateral consists of four points. The sum of its angles is always .

In the following we show some special quadrilaterals that have their own names.

## Square

In a square, all sides have equal lengths and all angles are .

## Rectangle

All angles are and opposite sides have equal length.

## Parallelogram

Opposite sides have equal length and are parallel but unlike the rectangle, the angles can have values other than . Opposite angles are equal.

## Trapezoid

Two opposite sides are parallel.

## Rhombus

Opposite sides have equal length and are parallel. Unlike the square, the angles can have values other than . Opposite angles are equal.

## Kite

The diagonals are perpendicular to each other and both pairs of adjacent sides have equal length.