# alternate exterior angles

- Author:
- Bradley Miller

- Topic:
- Angles, Straight Lines

## Given: Lines f and g are parallel.

## Make a conjecture about the relationship of the measures of the highlighted angles.

How do you think they relate?

## Test your conjecture!

Click the “Show Angle Measures” button and test your theory from above. Were you correct?

## Click and drag point C until lines g and f overlap completely.

What do you notice about the relationship between the two angles of interest?

## Tell me more!

Deduce the angle measures of 4 other angles in the diagram.