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Geometry 18 Online
OpenStudy (anonymous):

Regular decagon ABCDEFGHIJ rotates 360 degrees counterclockwise about it's center. At which angle of rotation does A' (the image of A) coincide with D?

OpenStudy (happyfeet8040):

We need to find what angle the vector A makes with the the vector D. the central angle subtended by each side is (360/10) the angle made by A' with vector D is 180-7*(360/10) since the rotation is counterclockwise the angle you are looking for is 360-(180-7*(360/10))

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