The rectangle which is equilateral is called as square.
a square - an equilateral square a rectangle - an equilateral rectangle
An equilateral rectangle is a square.
a square is but not a rectangle
A rhombus is never a rectangle. A rhombus has four sides that are equilateral whereas with a rectangle the two sides are equilateral and the two ends are equilateral.
"equilateral" is a fancy word meaning "has all sides equal". Such a rectangle is called a square.
A rectangle is not always equilateral, although it is always equiangular. A rhombus is not always equiangular, but is always equilateral. A square is both equilateral and equiangular.
the answer to this question is a square