# IM2 T10: Angles formed by secants (inside)

**WARNING**: The following diagram is not drawn to scale, so don't use any measuring tools in the following activity, just what you know about angles. 1. Construct segment BD. Using a text box, label the measure of angle CBD and BDE. 2. Using these values and what you know about triangles, label the measure of angle DGB. 3. Using a text box, label the measure of angle x.

## Summarize

A. Find the measures of angles x and y in problems 3 and 4 above. B. How can you find the measure of an angle formed by two chords if you know some arc measures?