# Geometrical constructions

**Bisecting lines**

When two lines **bisect** each other into equal parts, both lines should be of the same length. When two lines beset each other at right angles, and the points are joined together, the shape formed is a rhombus.

For example: the line CD bisects the line AB at right angles.

Point to note:

- In the diagram above, equal length are indicated using dashes on the lines.

**Bisecting angles**

A line **bisects** an angle if it divides the angle into two equal angles.

For example: in this diagram line BD bisects ABC.