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 1 from the EXPLORATIONS Book:
Exploring The Basics Of Geometry With Cabri

## Cabri Geometry Tour

#### Activity Overview

In this activity, students use the Cabri™ software to mark points, draw lines, construct parallel and perpendicular lines, angles, bisectors, and triangles. They learn how to use the tool to measure 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 1 - 5 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

Follow the Activity procedures:

• Mark points and label them
• Draw two intersecting lines and label the point of intersection
• Construct an angle by drawing two rays sharing a common vertex
• Measure the angle and then drag to change its measure
• Bisect the angle, and measure an angle created by the bisector
• Observe that the measure of this angle is half of the original
• Draw a line and construct a line parallel to that line
• Draw a line and construct a perpendicular line
• Construct and label a triangle
• #### After the Activity

Review student results:

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