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Frosting the Edges: Perimeter at the Cookie Shop

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Frosting the Edges: Perimeter at the Cookie Shop

Find the distance around each cookie and cake.

Pipe the frosting

Frosting goes all the way around the edge of each treat. Find the perimeter.

1.
A triangle cookie has sides of 5 centimeters, 6 centimeters, and 7 centimeters.

5 + 6 + 7 = centimeters

2.
A square cookie has sides that are each 8 centimeters long.

Perimeter = centimeters

3.
A rectangle sheet cake is 12 inches long and 9 inches wide.

Perimeter = inches

4.
A hexagon cookie has 6 sides. Each side is 4 centimeters long.

Perimeter = centimeters

5.
A pentagon cookie has sides of 3, 5, 5, 4, and 6 centimeters.

Perimeter = centimeters

Missing sides

Use the perimeter to find the missing side length.

6.
A triangle cookie has a perimeter of 21 centimeters. Two of its sides are 6 centimeters and 8 centimeters. How long is the third side?

The third side is centimeters.

7.
A rectangle brownie tray has a perimeter of 30 inches. It is 9 inches long. How wide is it?

The tray is inches wide.

8.
A square cake has a perimeter of 36 inches. How long is each side?
Question 8 options
9.
A cookie has 4 sides. Three of its sides are 7 centimeters, 4 centimeters, and 5 centimeters. Its perimeter is 24 centimeters. How long is the fourth side?

The fourth side is centimeters.

Cookie shop challenges

Find each perimeter. Then answer the question.

10.
Sort the cookies by perimeter. All the sides of the square, the pentagon, and the hexagon are the same length.
11.
Which cookie needs the most frosting around its edge?
Question 11 options
12.
Mia frosts the edge of a rectangle cookie that is 6 centimeters long and 4 centimeters wide. She says the perimeter is 10 centimeters. What mistake did she make? What is the correct perimeter?