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A regular pentagon is rotated counterclockwise about its center until it coincides with its original position.  If the pentagon is rotated by an obtuse angle, then what is the obtuse angle?

 Nov 26, 2020
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A pentagon has 5 sides, therefore its rotational symmetry is 72 degrees, but that is not an obtuse angle so 2*72 is 144, which is an obtuse angle so therefore the obtuse angle is 144 degrees

 Nov 26, 2020

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