Math 7 - Circles

Radius

100

Define Radius

Radius is the distance from the center of the circle to any point of it’s outside.

200

If a circle's diameter is 10, what is its radius?

5

300

If a circle's circumference is 18.84, what is its radius?

3

400

If a circle's area is 200.96, what is its radius?

8

500

Arthur ran around a circular field 3 times. If he ran a total distance of 750 m, what is the radius of the field?

39.81m

Diameter

100

Define Diameter

The distance across a circle through the centre

200

If a circle's radius is 12, what is its diameter?

24

300

If a circle's circumference is 78.5, what is its diameter?

25

400

If a circle's area is 314, what is its diameter?

20

500

What is the diameter of a circle with a radius of 18?

36

Circumference

100

Define Circumference

The distance around the outside edge of the circle

200

If a circle's radius is 1, what is its circumference?

6.28

300

If a circle's diameter is 15, what is its circumference?

47.1

400

If a circle's area is 153.86, what is its circumference?

21.98

500

The radius of a circle that it's circumference is 615 cm. 

97.92

Area

100

Define Area

The space inside the boundary of a circle

200

If a circle's radius is 3, what is its area?

28.26

300

If a circle's diameter is 1, what is its area?

.785

400

If a circle's circumference is 18.84, what is its area?

28.26

500

A storm is expected to hit 7 miles in every direction from a small town. What is the area that the storm will affect?

153.86 square miles

Pi

100

What number do we use for pi?

3.14

200

FILL IN THE BLANK:

The first 10 questions digits of pi?

3.141592653

300

What is the formula for circumference?

C = pi * D

400

What is the formula for area?

A = pi * r^2

500

What fraction is the closest to pi?

22/7