1. Draw a circle with center A and radius AB.
2. Draw an arc with center B and radius BA inersecting the circle in two places.
3. Connect these two intersections.
4. Where that line segment intersects AB, put a point D. Using CD as radius as shown, draw an arc interecting the circle in two points. (Two seperate arcs shown).
5. Mark off several more arcs as shown.
6. Connect the arc centers with line segments as shown to make a heptagon.

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