To print this tutorial, use this version . The most common quadrilaterals that you will see in the GMAT are the parallelogram, the rhombus, the rectangle and the square. 2 pairs of parallel sides. 2 pairs of equal sides. Diagonals bisect each other i.e. cut each other exactly in half.
Opposite angles are equal.
Rhombus A rhombus is a parallelogram in which all the sides are equal. 2 pairs of parallel sides. 4 equal sides. Diagonals bisect each other i.e. cut each other exactly in half. Diagonals are perpendicular.