• ### Unit 5: Polygons and Quadrilaterals

A polygon is a shape that has no curves. In this unit, we will focus on quadrilaterals, which are polygons with four sides. While each has their own set of characteristics, they share some properties with other quadrilaterals.

Completing this unit should take you approximately 4 hours.

• ### 5.1: Sum of Interior Angles of a Polygon

Before we can begin studying polygons, we need to develop an understanding of the language of polygons and quadrilaterals.

• ### 5.2: Sum of Exterior Angles of a Convex Polygon

In addition to determining the sum of the interior angles of a polygon, we can determine the sum of the exterior angles in a convex polygon.

• ### 5.3: Parallelograms

A parallelogram is a type of quadrilateral we encounter often. A parallelogram is a quadrilateral where two pairs of sides are parallel. In this section, we discuss the properties of parallelograms and how to classify them.

• ### 5.4: Trapezoids

A trapezoid is a different type of quadrilateral where only one pair of sides is parallel.

• ### 5.5: Kites

The last special type of quadrilateral we explore is the kite. One example of a kite quadrilateral is the traditional kite shape you may have flown as a child. But there are many other examples of the quadrilateral kite shape.

• ### 5.6: Coordinate Geometry

Finally, we review an overview of the properties of quadrilaterals.