Dynamic Geometry: Basic Constructions

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Triangles

Level

6-8

Activity Time

60 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

TI-Presenter™

LCD Projector
Two screens

Resource Types

Lessons

Report an Issue

Dynamic Geometry: Basic Constructions

Activity Overview

Students use the Cabri™ Jr. application to draw triangles and construct perpendicular bisectors on the sides of a triangles. They study the properties of a triangle and understand how the measures of angles of a triangle is always 180 degrees.

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 - 19 from the attached PDF file for your class

During the Activity

Distribute the pages to the class.

Follow the Activity procedures:

Construct an acute scalene triangle and label its vertices

Measure the angles of the triangle

Construct three perpendicular bisectors on each of the sides of the triangle

Determine the point of intersection of the perpendicular bisectors

Hide the perpendicular bisectors and display only the intersection point

Make conjectures about the intersection of the perpendicular bisectors of a triangle when the triangle is acute, right, or obtuse

Calculate the sum of measures of the angles of the triangle

Move a vertex and observe the change in the measure of the angles

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

6-8

Activity Time

60 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

TI-Presenter™

LCD Projector
Two screens

Resource Types

Lessons

Report an Issue

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Dynamic Geometry: Basic Constructions

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

Dynamic Geometry: Basic Constructions

Before the Activity Files

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

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