Quadrilateral

Definition

A quadrilateral is a four-sided polygon with four angles. The sum of the interior angles of any quadrilateral is 360 degrees.

5 Must Know Facts For Your Next Test

1. A square, rectangle, rhombus, and trapezoid are all types of quadrilaterals.
2. The area of a rectangle (a type of quadrilateral) can be calculated using the formula length × width.
3. The area of a parallelogram (another type of quadrilateral) is found using base × height.
4. In a trapezoid, the area is calculated as (1/2) × (sum of parallel sides) × height.
5. A kite, which has two pairs of adjacent sides that are equal, is also classified as a quadrilateral.

Review Questions

• What is the sum of the interior angles in a quadrilateral?
• Name three different types of quadrilaterals.
• How do you calculate the area of a parallelogram?

Related terms

Polygon:

A closed figure with three or more sides.

Trapezoid:

A type of quadrilateral with at least one pair of parallel sides.

Parallelogram:

A type of quadrilateral where opposite sides are parallel and equal in length.