# Symmetry

**Reflection symmetry**

**Reflection** or **line of symmetry** is the line through a shape where on half is the mirror image of the other. The mirror line is also called the **line of symmetry**.

**Rotational symmetry**

**Rotational symmetry** is where an object fits exactly onto itself when it is turned through a point at its centre.

**Order of rotational symmetry** is the number of times an object fits onto itself in a 360° turn. For example, an order of **rotational symmetry** of one, is where the object has to be rotated through 360° before it fits onto itself again.

**Reflection symmetry in 3-D shapes**

A 3-D shape can at times be divided into two symmetrical parts. This shaded area in the cube below is called a **plane of symmetry**.

Eight planes of symmetry can be drawn for a cube, as follows: