A rhombus is a parallelogram with four equal sides and opposite equal angles. A rhombus can be a square, or if it has two acute angles and two obtuse angles, it takes the shape of a diamond. The rhombus gets its name from the Greek rhómbos, which means "a spinning top." An Rhombus is an quadrilateral and an parallelogram. The sum of the interior angles is 360 degrees. The exterior angle of an rhombus is always 360 degrees.