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Geometry 10 Online
OpenStudy (anonymous):

Regular decagon ABCDEFGHIJ rotates 360° counterclockwise about its center. At which angle of rotation does A′ (the image of A) coincide with D? Example: http://assets.openstudy.com/updates/attachments/533602f2e4b0b47fca85a2d4-kaylaaa14-1396048656287-abc.jpg

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