Properties of the Centers 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-84 series

Applications

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

Other Materials

This is Activity 20 from the EXPLORATIONS Book:
Cabri™ Jr.: Interactive Geometry Activities and Investigations".

Resource Types

Lessons

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Properties of the Centers of a Triangle

Activity Overview

Students investigate the sum of the measures of the interior angles of a triangle. This activity explores interior angles, and their relationship with the exterior angles of a triangle.

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 125 - 127 from the attached PDF file for your class

During the Activity

Distribute the pages to your class.

Follow the Activity procedures:

Use the AppVar to go directly to the exploration section

Construct a triangle and its four centers

Adjust the construction to further investigate the circumcircle and orthocenter

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 Notes1 PDF Teacher Notes2 PDF Teacher-Student PDF CBIG2001.8xv CBIG2002.8xv

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-84 series

Applications

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

Other Materials

This is Activity 20 from the EXPLORATIONS Book:
Cabri™ Jr.: Interactive Geometry Activities and Investigations".

Resource Types

Lessons

Report an Issue

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Properties of the Centers of a Triangle

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

Properties of the Centers of a Triangle

Before the Activity Files

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

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