Angles of a Triangle

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Triangles

Level

9-12

Activity Time

90 Minutes

Software

TI Connect™

TI Calculator

TI-83 Plus Family

TI-84 series

Applications

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

Other Materials

This is Activity 4 from the EXPLORATIONS Book:
Exploring Mathematics with Cabri™ Jr. Application

Resource Types

Lessons

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Angles of a Triangle

Activity Overview

In this activity, students will measure angles and investigate the relationships between interior and exterior angles of a triangle. They understand the definition of interior angles, exterior angles, adjacent angles, supplementary angles, and remote interior 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 cables

See the attached PDF file for detailed instructions for this activity

Print pages 45 - 52 from the attached PDF file for your class

During the Activity

Distribute the pages to your class.

Follow the Activity procedures:

Draw a triangle to fill most of the screen

Measure the three interior angles

Calculate the sum of the interior angles

Drag a vertex of an angle and observe what happens to the angle measures and their sum

Construct a line on one side of the triangle

Construct and label a point on the line to the right of the triangle

Measure the exterior angle, adjacent interior angle, and the two remote interior angles

Understand the relationship between exterior angles and the interior angles

After the Activity

Students will fill in the Data Collection and Analysis sheet.

Review student results:

As a class, discuss questions that appeared to be more challenging

Re-teach concepts as necessary

Download Files

Download All Files (ZIP)

Before the Activity Files

Teacher Notes Appendix A PDF Teacher Notes Appendix B PDF Teacher Notes PDF

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Triangles

Level

9-12

Activity Time

90 Minutes

Software

TI Connect™

TI Calculator

TI-83 Plus Family

TI-84 series

Applications

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

Other Materials

This is Activity 4 from the EXPLORATIONS Book:
Exploring Mathematics with Cabri™ Jr. Application

Resource Types

Lessons

Report an Issue

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Angles of a Triangle

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

Angles of a Triangle

Before the Activity Files

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

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