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Mathematics 19 Online
OpenStudy (anonymous):

An irregular parallelogram rotates 360° about the midpoint of its diagonal. How many times does the image of the parallelogram coincide with its preimage during the rotation? (A)2 (B)4 (C)6 (D) 8

OpenStudy (welshfella):

its a long time since i was in school - we wre never taught irregular parallelograms. I've never heard of them...

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