Most people think of a diamond when they think of a Rhombus. A Rhombus can take the shape diamond, but it can take on other shapes as well. Here are 10 Properties of a Rhombus A Rhombus is a Quadrilateral A Rhombus has four sides. The sides of a rhombus are congruent The opposite sides are parallel The opposite angles of a Rhombus are equal. The diagonals of a rhombus are perpendicular. The diagonals of a Rhombus create four equal triangles. The perimeter of a Rhombus equals 4 x Sides The formula for area equals ½ d1 * d2 d = length of the diagonals The diagonals bisect one another. MooMooMath uploads a new Math Video Everyday.