Education Technology

# Angles and Transversals

Math: Geometry: Points, Lines and Angles
9-12
90 Minutes
TI Connect™
TI-83 Plus Family
TI-84 Plus
TI-84 Plus Silver Edition
This is Activity 3 from the EXPLORATIONS Book:
Cabri™ Jr.: Interactive Geometry Activities and Investigations.
Lessons

# Angles and Transversals

Activity Overview

Students explore the relationships of angles formed when two parallel or non-parallel lines are cut by a transversal. This activity investigates the terms: Transversal, corresponding angles, alternate interior angles, alternate exterior angles, same-side interior angles, and same-side exterior angles.

Before the Activity

• Install the Cabri: Jr. App on the students' graphing calculators using TI-Connect™, a TI Connectivity Cable and the Unit-to-Unit Link Cable
• Use the TI-Navigator™ to transfer the attached Cabri Jr. AppVar files to each calculator
• See the attached PDF file for detailed instructions for this activity
• Print pages 15 - 18 from the attached PDF file for your class
• During the Activity

Distribute the pages to your class.

• Use the AppVar to go directly to the exploration section
• Draw two non-parallel lines cut by a transversal
• Drag each line on a point on the line to find conditions when the measures of the corresponding angles are equal
• Measure each angle and determine the relationship between pairs of angles
• Draw two parallel lines cut by a transversal
• Drag the lines and the points on the lines and note the relationship between pairs of angles
• After the Activity

Review student results:

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