a right angle
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A four-sided polygon with four congruent sides and four equal angles is a square
it is called a square
An impossibility but a square and a rectangle have four interior right angles.
A square or a rectangle are both quadrilaterals consisting of four right angles.
A rectangle may be called a parallelogram but they are both 4 sided quadrilaterals. A parallelogram can be called a rectangle if all four angles are right angles (90 degrees). A parallelogram can be called a rhombus if all four sides are the same size. A parallelogram can be called a square if all four angles are right angles and all four sides are the same size