I need help with math

Mathematics
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A parallelogram rotates about its center. At what angle of rotation will the image of the parallelogram coincide with its preimage?

a) 30°

b) 90°

c) 180°

d) 270°

e) 315°

Feb 13th, 2015

The Right Answer is:- c) 180°

Feb 13th, 2015

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