5. Parallelogram

Parallelogram

Introduction to quadrilateral

A quadrilateral is a plane figure that has four sides or edges, so having four corners or vertices. Quadrilaterals will typically be of standard shapes with four sides like rectangle, square, trapezoid, and kite or irregular and uncharacterized. 

Quadrilateral: trapezium
Properties: two sides are parallel
Diagram:

Introduction to parallelogram

A parallelogram is a special kind of quadrilateral in which both pairs of opposite sides are parallel.

Definition and properties of a parallelogram

• Quadrilateral: parallelogram
  Properties: two sides are parallel and opposite angles are equal
  Diagram:

 Area of a parallelogram = base x height

The four basic properties of a parallelogram are:

1. Opposite sides of a parallelogram are equal
2. Opposite angles of a parallelogram are equal
3. Diagonals divide the parallelogram into two congruent triangles
4. Diagonals bisect each other