Area and Circumference

Radius/Diameter

100

If the radius is 5 what is the DIAMETER?

10

200

If the diameter is 20 what is the RADIUS?

10

300

If the radius is 30 the DIAMETER is?

60

400

If the radius is 20 what is the DIAMETER?

40

500

If the Radius is 50 what is the DIAMETER?

100

Circumference - Radius

100

Find circumference: When radius = 5

31.42

200

Find Circumference when Radius - 10

62.83

300

Find Circumference when Radius = 25

157.08

400

Find Circumference when Radius = 50

314.16

500

Find Circumference when Radius = 75

471.24

Area - Radius

100

Find Area when Radius = 4

16 pi

200

Find Area when Radius = 14

196 pi

300

Find Area when Radius = 20

400 pi

400

Find Area when Radius = 12

144pi

500

Find Area when Radius = 15

225 pi

Area/Circumference - Diameter

100

What is the area of a circle with a diameter of 6?

36 pi

200

What is the circumference of a circle with a diameter of 4?

4 pi

300

What is the area of a circle with a diameter of 22?

121 pi

400

What is the circumference of a circle with a diameter of 22?

22 pi

500

What is the area of a circle with a diameter of 100?

2500 pi

Word Problems

100

A rug has a diameter of 2 feet. How much space does the rug take up on the floor?

pi

200

A circular pond has diameter 8 m and needs to be fenced for the protection of children. What length of fencing is required?

8 pi

300

A car wheel has a radius of 35 cm. What is the circumference of the wheel?

70 pi

400

A lawn sprinkler sprays water 5 feet in every direction as it rotates. What is the area of the sprinkled lawn?

25 pi

500

The rope connecting a goat to a pole is 8 m long. What area of grass can the goat eat?

64 pi