You will need to use your knowledge of parallelograms, rectangles, rhombi, squares, trapezoids, and isosceles trapezoids to prove the properties of quadrilaterals. You have already learned the definitions for each of the quadrilaterals. Each one of these quadrilaterals has properties that can be proved. In this topic, you will explore these proving properties.

Essential Question

• How do you prove the properties of a quadrilateral?

Warm-Up

There are many different types of quadrilaterals. Before you use direct proofs to prove the properties of quadrilaterals, test your knowledge of these figures in this non-graded interactivity. Click the player button to get started.