# Quadrilaterals

**Quadrilaterals**

Quadrilaterals are named according to their properties and are as follows:

**Parallelogram**

A **parallelogram** has opposite sides which are equal and parallel. The diagonals of a parallelogram **bisect** each other and it has a rotational symmetry of order 2.

**Rhombus**

A **rhombus **is a parallelogram but with four equal sides. The diagonals of a rhombus beset each other at right angles, it has a two line symmetry and a rotational symmetry of two.

**Rectangle**

A **rectangle** has opposite sites of equal length and has four right angles. It also has two lines of symmetry and a rotational symmetry order of two.

**Square**

A **square** has four equal sides and four right angles. It also has four lines of symmetry and a rotational symmetry order of 4.

**Trapezium**

A **trapezium **has one pair of opposite sides that are parallel. It also has one line of symmetry but no rotational symmetry.

**Isosceles trapezium**

In an **isosceles trapezium **the two opposite non-parallel sides are the same length. It also has diagonals of the same length but with only one line of symmetry.

**Kite**

A **kite **has two pairs of adjacent sides of equal length. The diagonals of a kite cross at right angles and it only has one line of symmetry.

**Arrowhead**

An **arrowhead or delta **has two pairs of adjacent sides of equal length and one interior angle that is more than 180°. The diagonals cross at right angles outside the shape and has only one line of symmetry.