G.156 circle circumscribed about a polygon — Heath

IV.def.6

A circle is said to be circumscribed about a figure when the circumference of the circle passes through each angle of the figure about which it is circumscribed.

Dependency Graph

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Required for

G.157, G.161, G.162, G.163, G.164, G.166, G.586, G.589, G.597, G.601