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Radius
Diameter
Circumference
Area
Pi
100

Define Radius

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

100

Define Diameter

The distance across a circle through the centre

100
Define Circumference
The distance around the outside edge of the circle
100
Define Area
The space inside the boundary of a circle
100
What number do we use for pi?
3.14
200
If a circle's diameter is 10, what is its radius?
5
200
If a circle's radius is 12, what is its diameter?
24
200
If a circle's radius is 1, what is its circumference?
6.28
200
If a circle's radius is 3, what is its area?
28.26
200
FILL IN THE BLANK:

The ratio of ____________ to _____________ = pi

Circumference

Diameter

300
If a circle's circumference is 18.84, what is its radius?
3
300
If a circle's circumference is 78.5, what is its diameter?
25
300
If a circle's diameter is 15, what is its circumference?
47.1
300
If a circle's diameter is 1, what is its area?
.785
300
What is the formula for circumference?
C = pi * D
400
If a circle's area is 200.96, what is its radius?
8
400
If a circle's area is 314, what is its diameter?
20
400
If a circle's area is 153.86, what is its circumference?
21.98
400

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

28.26

400
What is the formula for area?
A = pi * r^2
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
500

Mr. Smith designed a circular walkway in

front of his house. The diameter of the walkway is

about 6 feet long. How does the diameter of the

walkway compare to its circumference?

The diameter is about 1/3 as large as the

circumference.

500

Elena cycled to school. Find the distance traveled by Elena if her bicycle wheels rotated 840 times and the radius is 0.25 m.

1318.8
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

500
What fraction is the closest to pi?
22/7