1) Draw a circle, place an X at its center.
2) Draw the radius. Label it AX.
3) Draw a circle with radius AX, centered at A.
Label the intersection points as B and C.
4) Connect B and C. BC bisects AX in E.
5) Draw a third circle with radius BE, centered at B.
This circle intersects circle A in D.
6) Trace the distance BD around the circle.
7) Connect adjacent vertices.