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Mathematics 16 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, or 120°). It will take (2, 4, 6, or 8) increments of that degree of clockwise rotation for A′ (the image of A) to coincide with C.

OpenStudy (anonymous):

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