Geometry, Please Help!

Question

This diagram was created by starting with points A and B and using only straightedge and compass to construct the rest. All steps of the construction are visible.

Diagram: https://assets.learnosity.com/organisations/154/32faa27c-6bfc-46a7-bf48-2eae99bc5772.png

Describe precisely the straightedge and compass moves required to construct the line CD in this diagram.

Answer 1

1. Set the compass to touch both point A and point B.
2. Draw a circle with point A as its center
3. Without changing the compass setting, draw a circle with point B as its center
4. Label points C and D where the two circles intersect
5. Using the straightedge, draw a line through points C and D

Answer 2

A and B are centers of two equal circles.