# Solve Mixed Angle Problems

In this worksheet, students will use angle rules learnt previously to solve mixed angle problems

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Apply the Properties of Angles

Difficulty level:

#### Worksheet Overview

In this activity, we will calculate missing angles using different angle rules.

Let's recap the rules first!

Recap - Make a note of these!

Angles at a point = 360o

Angles on a straight line = 180o

Angles in a triangle = 180o

Angles on parallel lines - Z shape-  angles are equal -  alternate angles

Angles on parallel lines - F shape-  angles are equal -  corresponding angles

Angles on parallel lines - C shape-  angles add up to 180o -  co-interior angles

One more!

Vertically opposite angles:

This is when two lines form a cross X

The opposite angles are equal

You can see from the diagram that if A was 60the opposite A would be 60o too.

Likewise, if B is 120o the other B is too.

Also, A and B form a straight line. (you can see below)

So, if A = 60o

B = 180 - 60 =120o

You can look back at these rules at any point by clicking on the red help button on the screen.

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