# Classroom Activities

• ##### Subject Area

• Math: Geometry: Quadrilaterals and Polygons

9-12

45 Minutes

• ##### Device
• TI-84 Plus
• TI-84 Plus Silver Edition
• TI-84 Plus C Silver Edition
• TI-84 Plus CE
• ##### Software

TI Connect™ CE

• ##### Report an Issue

Properties of Parallelograms

Updated on 02/10/2015

#### Activity Overview

Students explore the various properties of parallelograms and the necessary and sufficient conditions that guarantee that a quadrilateral is a parallelogram.

#### Key Steps

• Students will use the Cabri™ Jr. App to discover several properties of parallelograms. Students will discover that opposite sides are congruent, opposite angles are congruent, and consecutive angles are supplementary.

• Next, students will discover that diagonals of a parallelogram bisect each other.

• As an extension, students will be asked to find the midpoint of all sides of a quadrilateral and connect these midpoints to form another quadrilateral. Students will be asked to discover what type of quadrilateral is created.