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In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
A square is a regular shape. It will have four sides of equal length, and a right angle (90 degrees) in each corner.
A rectangle can have four equal sides if each angle is 90 degrees. This shape is normally called a square.
The general name for a plane shape with four sides is a quadrilateral.
A square has four equal sides and four equal angles.