The four inside angles add up to 360 degrees.
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Polygon with four sides identical in length, four angles, all of which are 90 degrees.
The general name for a plane shape with four sides is a quadrilateral.
A square is a regular shape. It will have four sides of equal length, and a right angle (90 degrees) in each corner.
square
A rectangle can have four equal sides if each angle is 90 degrees. This shape is normally called a square.