Semi and Quarter Circles

Aiden is planning to build a semi-circular garden in his backyard. He needs to calculate the area to determine how much soil he needs. What is the formula he should use to calculate the area of his semi-circular garden?

• (1/2) * π * r^2

• 2 * π * r

• r^2

• π * r^2

William is making a semi-circular garden in his backyard. If the radius of the garden is 7 cm and he uses 3 as Pi, what would be the area of his garden?

• 35 cm^2

• 49 cm^2

• 21 cm^2

• 73.5 cm^2

Kai is planning to build a semi-circular garden in his backyard. The diameter of the garden is 10 meters. If he uses 3 as the value of Pi, what would be the area of his garden?

• 25.12 square meters

• 15.71 square meters

• 7.85 square meters

• 39.27 square meters

Zoe is planning to build a semi-circular garden in her backyard. If she wants the radius of the garden to be 5 units and she uses 3 as Pi, what would be the area of her garden?

• 37.5

• 25

• 15

• 40

Grace, Sophia, and Isla are working on a project to create a circular garden. They decide to only plant in a quarter of the circle. What is the formula they should use to find the area of the quarter circle where they will plant?

• 2πr

• 3πr

• r^2

• (πr^2)/4

Harper, Elijah, and Kai are working on a project to design a quarter circular garden with a radius of 4 meters. They decided to use 3 as Pi to calculate the area. What is the area of the garden they are designing?

• 12.5 square meters

• 16 square meters

• 8.5 square meters

• 6.5 square meters

What is the perimeter of this semi circle? 

• 12.6

• 20.6

• 25.1

• 33.1

Find the perimeter of a quarter circle with a radius of 3 inches.

• 15 inches

• 10.71 inches

• 20.41 inches

• 32 inches

Find the perimeter of a quarter circle with a radius of 10.

• 35.7

• 16.8

• 26

• 18.9

Find the perimeter of the figure.  Use 3.14 for pi.

• 20.56 in.

• 17.3 in.

• 17.8 in.

• 31.88 in.