Created on: September 10, 2008

Website Address: https://library.curriki.org/oer/Lesson--Dilations-and-Isometry

TABLE OF CONTENTS

- Selling Geometry
- Designing a Winner
- What's Your Angle, Pythagoras?
- TED Talk: House of the Future
- The Art of Triangles
- How Random Is My Life?
- Introduction to Angles
- Lesson -- Drawing right triangles from word problems
- Accessing Curriki Geometry Projects
- Introduction to Curriki Geometry

- Designing a Winner Resources
- Curriki Geometry Tools and Resources
- Problems -- Similarity
- Designing a Winner Teacher Edition
- Designing a Winner Student Edition
- Lesson -- Applying the sine and cosine ratios
- Equation of a tangent line
- Cabo SUP Challenge
- Similarity Tutorial
- ShowMe.com Reflection Videos

- Selling Geometry Resources
- Curriki Geometry Tools and Resources
- Lesson -- Rotation
- The World Runs on Symmetry
- Lesson -- Dilations and Isometry
- Lesson -- Composition of Transformations
- Cool Math 4 Kids: Tessellations
- Tessellations.org
- Euclid
- About Cloze Notes
- What's the point of Geometry? - Euclid
- Selling Geometry Project Teacher Edition
- Selling Geometry Project Student Packet

Lesson: Dilation and Isometries

Prerequisite Knowledge: Students should be familiar with reflections, rotations and translations. Students should be familiar with graphing on the coordinate plane.

Learning Objectives: Students will be able to identify and perform a dilation on the coordinate plane. Students will be able to understand the scale factor of dilation. Students will understand the concept of isometry and apply it to reflection, rotation and translation.

Key Ideas: Dilation (x,y) D scale of 4 (4x,4y)

The scale factor can refer to an enlargement or a reduction of a figure

Motivational
Problem: On a coordinate plane plot the points A(-2,0) B(-2,2) C(-1,2) and
D(0,-1). Perform the translation T(4,
-2). Plot the new points and record the
new coordinates labeling them A’B’C’. With the **original figure**
multiple each x,y coordinate by 3. Plot and record the new coordinates labeling
them A’’B’’C’’. Answer the following
questions about the new figures:

Important Questions: What is a scalar?