10. Below is a stage in the construction of a square inscribed in a circle.
A. Place the compass needle at the midpoint of AB, and draw a circle with a
diameter equal to DC.
B. Connect points A and C, points C and B, points B and D, and points D and A
with straight lines.
C. Place the compass needle at the midpoint of AB, and draw a circle with a
diameter equal to AB.
D. Draw a line through points C and D.