This activity is intended to supplement Geometry, Chapter 6, Lesson 5.
Time required: 25 minutes
Topic: Quadrilaterals & General Polygons
Prove and apply theorems about the properties of rhombuses, kites and trapezoids.
A trapezoid is a quadrilateral where one pair of sides is parallel while the other two sides are not. In an isosceles trapezoid the non-parallel sides are congruent. In this activity we will attempt to create an isosceles trapezoid from an ordinary trapezoid, then approach the problem in a different manner and finally, examine the properties of trapezoids.
This activity is designed to be used in a middle-school or high-school geometry classroom.
This activity is intended to be mainly teacher-led, with breaks for individual student work. Use the following pages to present the material to the class and encourage discussion. Students will follow along using their graphing calculators.
See the student worksheet on how to complete this activity.