rhombus
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A rhombus is a parallelogram with sides of equal length. Its opposite angles are equal and they bisect each other at right angles. The shape of a rhombus is sometimes known as a diamond, although a rhombus with angles of 90° would be a square.
Equilateral (all sides equal) parallelogram. As with a parallelogram, the rhombus has diagonally opposed angles of equal size. Its diagonals bisect each other at right angles, and its area is half the product of the lengths of the two diagonals. The shape is sometimes called a diamond. A rhombus whose internal angles are 90° is called a square.
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