Properties of Parallelograms

A parallelogram is a four-sided figure (quadrilateral) with opposite sides that are parallel and equal in length.

1. Opposite sides are equal in length. 2. Opposite angles are equal. 3. The diagonals bisect each other.

A rectangle is a parallelogram with four right angles.

A rhombus is a parallelogram with all four sides of equal length.

The diagonals of a rectangle are congruent (equal in length).

The diagonals of a rhombus bisect each other at right angles.

The sum of the interior angles of a parallelogram is 360 degrees.

The opposite angle is also 70 degrees, and the adjacent angles are 110 degrees each.

Area = base × height.

Length of side = Area / height.