- Draw circle O.
- Draw AB, the diameter of circle O.
- Divide AB into 9 parts.
- Draw a circle at A and B, each with radius AB. They cross each other at C.
- Find D, the second point from the left on AB.
- Draw a line through points C and D.
- CD crosses circle O at point E. Points A and E are points of the nonagon. Use them
to find the rest!