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In plane geometry, a square is a polygon with four equal sides and four equal interior angles. A square is a regular polygon, also known as a regular quadrilateral. Each interior angle is a right angle, that is, 90 degrees.

In geometry, a rectangle is defined as a quadrilateral with four equal interior angles, that is, all interior angles are right angles. From this definition, it can be concluded that the two opposite sides of a rectangle are of equal length, that is, a rectangle is a parallelogram. A square is a special case of a rectangle, and its four sides are of equal length. At the same time, a square is both a rectangle and a rhombus.

In a plane, a parallelogram with equal adjacent sides is a rhombus.

A quadrilateral with two sets of equal angles in the same plane is called a parallelogram.