Answer with step-by-step explanation:
1. First step:
Copy the radius r to make a chord on the circumference of the circle A.
(Copying the radius will make us keep each side of the same length).
2. Second step:
Copy the chord two times to make the sides of the triangle.
(Copying the chord twice so that we can make the equal sides of the triangle)
3. Third step:
Connect the two chord endpoints to subtend a 120-degree arc.
(We will connect the endpoints of these chords to make a triangle)
4. Fourth step:
Copy the chord of length r a second time.
(This will be the last step)