Measuring Angles in a Triangle

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Triangles

Level

9-12

Activity Time

30 Minutes

Software

TI Connect™

TI Calculator

TI-84 series

Applications

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

Resource Types

Lessons

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Measuring Angles in a Triangle

Activity Overview

In this activity, students learn about the sum of the angles in a triangle. They understand triangles and their interior angles. NCTM Geometry Standard covered: Analyze characteristics and properties of 2- and 3-dimensional geometric shapes and develop mathematical arguments about geometric relationships.

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

Set up the TI-Navigator™ system

See the attached PDF file for detailed instructions for this activity

Print pages 7-8 from the attached PDF file for your class

During the Activity

Distribute the pages to your class.

Follow the Activity procedures:

Draw a triangle using the Apps

Label the vertices of the triangle

Measure the interior angles of the triangle

Find the sum of the angles of the triangle

Move the vertex and measure the angles of the triangle and find the sum of its interior angles

TI-Navigator activity:

Use Screen Capture to identify problems with labeling

After the Activity

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 PDF

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Triangles

Level

9-12

Activity Time

30 Minutes

Software

TI Connect™

TI Calculator

TI-84 series

Applications

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

Resource Types

Lessons

Report an Issue

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Measuring Angles in a Triangle

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

Measuring Angles in a Triangle

Before the Activity Files

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

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