Properties of Parallelograms

1. Opposite sides are equal in length. 2. Opposite angles are equal. 3. The diagonals bisect each other. 4. Consecutive angles are supplementary.

All sides are equal, and opposite angles are equal. The diagonals bisect the angles.

Use the property that consecutive angles are supplementary (sum to 180 degrees).

The diagonals bisect each other.

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

Area = base × height.

The diagonals are perpendicular to each other and bisect the angles.

Each angle in a rectangle measures 90 degrees.

If one pair of opposite sides is both equal and parallel, then the quadrilateral is a parallelogram.

They bisect each other at right angles and bisect the vertex angles.