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 4 angles will add up to 360°.

Opposite angles on a cross are equal.

**Missing angles in quadrilaterals:**

A quadrilateral is any shape with 4 sides.

For example: square, rhombus, trapezium, parallelogram.

The angles in a quadrilateral add up to to 360°.