Calculate Missing Angles at a Point

In this activity, we will learn how to calculate angles in a full rotation. 

Sometimes we call these angles around a point.

We know that all angles around a point add together to make a total of 360°

For example, below we can see that one of the angles around a point is 240°

The other, a, is unknown. 

We can subtract the known angle from 360° to find the value of a.

360 - 240 = 120

a = 120°

Let's try an example question together.

Example

Calculate the other angle around this point.

Answer

Angle = 360° - 300° = 60°

Let's have a go at some questions now.