Library

Unit 1 - Lesson 11 - Grade 8: Illustrative Mathematics

By Formative Library
Last updated 2 months ago
10 Questions
Note from the author:
Grade 8 Unit 1
Lesson 11: What Is the Same?
CC BY 2021 Illustrative Mathematics®
Grade 8 Unit 1
Lesson 11: What Is the Same?
CC BY 2021 Illustrative Mathematics®
Lesson: What Is the Same?

Find the Right Hands (Warm Up)

Images for Launch
1.

A person’s hands are mirror images of each other. In the diagram, a left hand is labeled. Shade all of the right hands.

Are They the Same?

For each pair of shapes, decide whether or not they are the same.
2.

3.

4.

5.

Area, Perimeter, and Congruence

Student Task Statement
6.

Which of these rectangles have the same area as Rectangle R but different perimeter?

7.

Which rectangles have the same perimeter as Rectangle R but different area?

8.

Which have the same area and the same perimeter as Rectangle R?

9.

Use materials from the geometry tool kit to decide which rectangles are congruent. Shade congruent rectangles with the same color.

Cool Down: Mirror Images

Mirror Images

10.

Figure B is the image of Figure A when reflected across line ℓ. Are Figure A and Figure B congruent? Explain your reasoning.