Parallelogram

A parallelogram is a quadrilateral with two sets of parallel sides. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are congruent. The three-dimensional counterpart of a parallelogram is a parallelepiped.
==Properties==
* Two parallel sides are of equal length. 
* Area, A, of a parallelogram is A = BH, where B is the base of the parallelogram and H is its height. 
* Area of a parallelogram is twice the area of a triangle created by one of its diagonals. 
* Diagonals of a parallelogram bisect each other. 
* Parallelogram is a special case of the trapezoid. 
* Rectangle is a special case of the parallelogram. 
* Rhombus is a special case of the parallelogram.
Category:Geometry
Category:Math dictionary