We need to remember the relationships between the angles that a **transversal** makes when it crosses a pair of parallel lines:

We also need to know their names, so we need to know what are;

**vertically opposite angles**;**corresponding angles;****alternate angles;**and**interior angles**.

Using this information, let’s complete exercise 6 on page 7 of the core textbook (and if we have time, questions 4 to 9 of exercise 3 on page 141 of the extended textbook):

The answers are below: