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Geometry 18 Online
OpenStudy (anonymous):

ABCDEFGH is a regular octagon. The minimum degree of rotation by which this octagon can map onto itself is 30 45 90 120 °. It will take 2 4 6 8 increments of that degree of clockwise rotation for A′ (the image of A) to coincide with C.

OpenStudy (danjs):

what is the interior angle for this , it is a full circle cut into 8 equal pieces

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