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Unit 2 - Lesson 14 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 2
Lesson 14: Find the Area of Figures with Missing Sides
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 2
Lesson 14: Find the Area of Figures with Missing Sides
CC BY 2021 Illustrative Mathematics®
Lesson: Find the Area of Figures with Missing Sides

Notice and Wonder: Mystery Sides (Warm Up)

1.

What do you notice?

2.

What do you wonder?

The Mystery Side

3.

Tyler says that the missing side length is 5 meters because it looks longer than the sides that are 4 meters long.


Do you agree or disagree? Be prepared to explain your reasoning.

Practice with Mystery Sides

4.

Find the area of the figure. Explain or show your reasoning.

5.

Find the area of the figure. Explain or show your reasoning.

Cool Down: Mystery Side Area
6.

Find the area of the figure. Explain or show your reasoning.