Each angle has a measure of 120 degrees
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A square.
Well for a four sided figure the sum of the angles must equal 360 degrees
A rectangle.
Any plane figure with seven sides is a heptagon.If all the sides are equal, and all the angles are equal, it is a regular heptagon.
Four sided figure. All sides are the same length. All angles are equal. Four right angles. Both diagonals are equal.