Find the Missing Angles

In this activity, you will need to find missing angles.

Missing angles on a straight line

Angles on a straight line add up to 180°

To calculate a missing angle on a straight line, take away the known angle from 180°

Missing angles in a full turn

Angles in a full turn add up to 360°

To calculate a missing angle in a full turn, take away the known angle from 360°

Missing angles on intersecting lines

All four angles will add up to 360°

Opposite angles on a cross are equal.

Missing angles in quadrilaterals

A quadrilateral is any shape with four sides.

For example: square, rhombus, trapezium, parallelogram.

The angles in a quadrilateral add up to to 360°

Let's have a go at some questions.