Education Technology

# Activities

• ##### Subject Area

• Math: Geometry: Points, Lines and Angles

9-12

60 Minutes

• ##### Device
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition
• ##### Software

Cabri Geometry™
TI Connect™

• ##### Accessories

TI Connectivity Cable

• ##### Other Materials
This is Activity 2 from the EXPLORATIONS Book:
Exploring The Basics Of Geometry With Cabri

## Properties of Parallel Lines Cut by a Transversal

#### Activity Overview

In this activity, students create parallel lines and a transversal, and study the properties of the lines and their angles.

#### Before the Activity

Install the Cabri™: Jr. App on the students' graphing calculators using one of these two methods:

• TI-Connect™,  a TI Connectivity Cable, and the Unit-to-Unit Link Cable
• TI-Navigator™  "send to class" feature
• See the attached PDF file for detailed instructions for this activity
• Print pages 7 - 9 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Draw two parallel lines
• Construct a transversal
• Label the lines and the points of intersection
• Measure and label angle measurements
• Prepare a table which lists the pairs of angles, types of angles, and their measures
• Observe that the pairs of corresponding angles are equal
• Note that the pairs of alternate interior angles are congruent
• Identify that the pairs of consecutive interior angles are supplementary
• Observe that the pairs of alternate exterior angles are congruent
• Drag an intersection point around the screen to verify whether the relationship between angles remains same
• #### After the Activity

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary