Dilations in the Plane (Transformations)

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Transformational Geometry

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 3 from the EXPLORATIONS Book:
Exploring Mathematics with Cabri™ Jr. Application

Resource Types

Lessons

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Dilations in the Plane (Transformations)

Activity Overview

In this activity, students will explore the properties of dilations and the relationships between the original and image figures.

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 31 - 40 from the attached PDF file for your class

During the Activity

Distribute the pages to your class.

Follow the Activity procedures:

Construct a slider tool to generate a number in the range of approximately -4.5 to 4.5 units

Draw a small scalene triangle on the left half of the screen and mark a point in the center of the screen

Dilate the triangle

Investigate the relationship between the original triangle (the pre-image) and the new triangle (the image)

Drag a vertex of the pre-image and the center of dilations

Observe what happens to the image

Measure the lengths of corresponding sides, angles, and areas of the pre-image and image

Explore different dilation factors

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: Transformational Geometry

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 3 from the EXPLORATIONS Book:
Exploring Mathematics with Cabri™ Jr. Application

Resource Types

Lessons

Report an Issue

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Vernier EasyData,Vernier EasyLink and Vernier EasyTemp are registered trademarks of Vernier Science Education.

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Dilations in the Plane (Transformations)

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

Dilations in the Plane (Transformations)

Before the Activity Files

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

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