Let’s remind ourselves of some of the things we know about angles.

How many angles are there in a **complete turn**? If angles are on a **straight line**, what must they add up to?

What’s a **right angle**? What does it look like? How many **degrees** is it?

What are vertically opposite angles? What do we know about them?

**Exercise**

Let’s complete exercise 9A from page 130 of the textbook:

The answers are below:

**Parallel lines**

When a **transversal **crosses a pair of parallel lines, there are various properties of the angles we should know about. Let’s look at a few with the teacher.

**Exercise**

Let’s complete exercise 9B from pages 131 and 132 of the textbook:

The answers are below: