Circles

Circle Vocab

100

Line that goes all the way through a circle

Diameter

200

Line that goes halfway through the circle (or half the diameter)

Radius

300

Total amount of space inside the circle

Area

400

The "perimeter" of the circle, or the distance around it

Circumference

500

the name for the number 3.1415...

Pi

Find the Radius

100

Find the radius of a circle with a diameter of 10

5

200

Find the radius of a circle with a diameter of 20

10

300

Find the radius of a circle with a diameter of 30

15

400

Find the radius of a circle with a diameter of 5

2.5

500

Find the radius of a circle with a diameter of 3

1.5

Find the diameter

100

Find the diameter of a circle with a radius of 5

10

200

Find the diameter of a circle with a radius of 3

6

300

Find the diameter of a circle with a radius of 7

14

400

Find the diameter of a circle with a radius of 10

20

500

Find the diameter of a circle with a radius of 32

64