Grade 3 Unit 7
Lesson 7: Same Perimeter, Different Shapes
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 7
Lesson 7: Same Perimeter, Different Shapes
CC BY 2021 Illustrative Mathematics®
123 + 75 + 123 + 75 = 100 + 100 + 70 + 70 + 5 + 5 + 3 + 3
Explain your reasoning.
123 + 75 + 123 + 75 = (2 x 123) + (2 x 75)
Explain your reasoning.
123 + 75 + 123 + 75 = 208 + 208
Explain your reasoning.
123 + 75 + 123 + 75 = 246 + 150
Explain your reasoning.
I chose shape
What is the perimeter of the shape? Explain or show your reasoning.
I chose shape
What is the perimeter of the shape? Explain or show your reasoning.
I chose shape
What is the perimeter of the shape? Explain or show your reasoning.
Find one shape that has the same perimeter as one of the shapes you chose earlier. Be prepared to explain your reasoning.
Draw 2 shapes with the perimeter of 12 units.
Draw 2 shapes with the perimeter of 26 units.
Draw 2 shapes with the perimeter of 48 units.
With your partner, choose a length. Then, draw your own shape with that perimeter.
Share the shapes you drew and discuss how they are alike and how they are different.
Draw 2 different shapes that have a perimeter of 32 units.