What is a quadrilateral with 4 equal sides and 2 sets of opposite angles the same size?

A quadrilateral with four equal sides and two sets of opposite angles that are the same size is known as a rhombus. In a rhombus, all sides are of equal length, and the opposite angles are equal, while the adjacent angles are supplementary. Additionally, the diagonals of a rhombus bisect each other at right angles and are not necessarily equal in length.