Unit 1 - Lesson 6 - Grade 8: Illustrative Mathematics

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Grade 8 Unit 1
Lesson 6: Describing Transformations
CC BY 2021 Illustrative Mathematics®

Instructions

Grade 8 Unit 1
Lesson 6: Describing Transformations
CC BY 2021 Illustrative Mathematics®

Lesson: Describing Transformations

Finding a Center of Rotation (Warm Up)

Andre performs a 90-degree counterclockwise rotation of Polygon P and gets Polygon P’, but he does not say what the center of the rotation is. Can you find the center?

Info Gap: Transformation Information

Your teacher will give you either a problem card or a data card. Do not show or read your card to your partner.

If your teacher gives you the problem card:

1. Silently read your card and think about what information you need to be able to answer the question.

2. Ask your partner for the specific information that you need.

3. Explain how you are using the information to solve the problem.

Continue to ask questions until you have
enough information to solve the problem.

4. Share the problem card and solve the
problem independently.

5. Read the data card and discuss your
reasoning.

If your teacher gives you the data card:

1. Silently read your card.

2. Ask your partner “What specific information do you need?” and wait for them to ask fori information.

If your partner asks for information that is
not on the card, do not do the calculations
for them. Tell them you don’t have that
information.

3. Before sharing the information, ask “Why do you need that information?” Listen to your partner’s reasoning and ask clarifying questions.

4. Read the problem card and solve the problem independently.

5. Share the data card and discuss your
reasoning 

Solve the problem and explain or show your reasoning.

Pause here so your teacher can review your work. Ask your teacher for a new set of cards and repeat the activity, trading roles with your partner.

Cool Down: Describing a Sequence of Transformations

Describing a Sequence of Transformations

Jada applies two transformations to a polygon in the coordinate plane. One of the transformations is a translation and the other is a reflection. What information does Jada need to provide to communicate the transformations she has used?