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The angles in a quadrilateral add up to 360°.

The properties of different kinds of quadrilateral are listed below.

Square

A square is the only regular quadrilateral.

All angles are equal (90°).

All sides are of equal length.

Opposite sides are parallel.

The diagonals bisect each other at 90°.

The diagonals are equal in length.

Rectangle

With a rectangle, all angles are equal (90°).

Opposite sides are of equal length.

The diagonals are equal in length.

Opposite sides are parallel.

The diagonals bisect each other.

Rhombus

With a rhombus, all sides are of equal length.

Opposite sides are parallel.

Diagonally opposite angles are equal.

The diagonals bisect each other at 90°.

Parallelogram

A parallelogram has two pairs of equal angles opposite each other.

Opposite sides are of equal length.

Opposite sides are parallel.

The diagonals bisect each other.

Kite

A kite has two pairs of sides of equal length.

One pair of diagonally opposite angles is equal.

Only one diagonal is bisected by the other.

The diagonals cross at 90°

Trapezium

A trapezium has one pair of parallel opposite sides.