| The third stage is similar to the second stage. |
| Extend CE and HG. |
| Mark M on the extended HG so that |
| Draw a perpendicular at M until it intersects the extendended CE. |
| Call the point of intersection N. |
| With G as center, draw the circle through N. |
| Starting with N as center, mark arcs on the circle using radius GN. |
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