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29-05-2016
Mathematics

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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?

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29-05-2016

Hello,

A parallelogram has a center of symmetry which is a rotation of 180°

The image of parallelogram coincide with its preimage twice:
at 180° and at 360°.

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