Circle Measurements

Radius and Diameter

100

R= 6cm, D = ?

12cm

200

D = 26cm, R = ?

13cm

300

R = 57cm, D = ?

114cm

400

R = 45cm, D = ?

90cm

500

D = 117cm, R = ?

58.5cm

Circumference

100

D = 8cm, C = ?

25.12cm

200

D = 23cm, C = ?

72.22cm

300

D = 19cm, C = ?

59.66cm

400

R = 32cm, C = ?

200.96cm

500

R = 12cm, C = ?

75.36cm

Area

100

R = 12cm, A = ?

452.16cm²

200

R = 10cm, A = ?

314cm²

300

R = 43cm, A = ?

5805.86cm²

400

D = 56cm, A = ?

2461.76cm²

500

D = 90cm, A = ?

6358.5cm²

Word Problems

100

If the middle of the circle to one side is 5cm, what is the length of one side of the circle to the other?

10cm

200

A group of friends order a 18inch pizza. What is the measurement of the crust of the pizza all around?

56.52inches

300

A sprinkler is in the middle of the lawn. It shoots out 5.2cm of water. If it continues in a circular motion, what is the area that it will cover? 

84.91cm²

400

Emily is running a circular track. The track is 400m around. How many metres would it be from one side of the track to the other. 

127.39m

500

Three friends want to equally share a pizza with a diameter of 24cm. How many square cm will each friend get?

150.72cm²