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A regular quadrilateral has 4 angle and their sum must be 360 degrees by the general formula 180 degrees (n-2) for the number of angle in an n sided polygon. So there are 180(4-2)=360 degrees. Since it is regular this means each angle is 360/4=90 degrees.

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15y ago
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Q: Proof of angle sum property of a regular quadrilateral?
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