Here is an angle:

- Estimate the location of a point
*D*so that angle*ABD*is approximately congruent to angle*CBD*. - Use compass and straightedge tools to create a ray that divides angle
*CBA*into 2 congruent angles. How close is the ray to going through your point*D?*

Take turns with your partner, drawing and bisecting other angles.

- For each angle that you draw, explain to your partner how each straightedge and compass move helps you to bisect it.
- For each angle that your partner draws, listen carefully to their explanation. If you disagree, discuss your thinking and work to reach an agreement.