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Formula
radius/diameter
Circumference
Area
A little of Everything
100

The formula for the circumference of a circle, given the diameter.

C = π d

100

If the diameter is 14 inches, this is the radius.

7 inches

100
Find the circumference, if the radius is 3 ft. Round to the nearest hundredth.
18.85 ft
100
Find the area, if the radius is 3 m.
28.27 sq m
100
Round the following to the nearest hundredth. 351.3274123
351.33
200

The formula for the circumference of a circle, given the radius.

C = 2 π r

200
If the radius is 5 m, this is the diameter.
10 m
200

Find the circumference given the diameter is 20 m.

62.83 m

200
Find the area, if the radius is 9 yards.
254.47 sq yards
200
Round the following to the nearest hundredth. 113.098167
113.10
300

The formula for the area of a circle.

A = pi r squared

300
Given the diameter is 25 cm, what is the radius?
12.5 cm
300

Find the circumference, given the radius is 2 miles.

12.57 miles

300
A round loaf of bread has a radius of 4 inches, find the area.
50.27 sq inches
300
Round the following to the nearest hundredth. 21.991346
21.99
400

What are the two formulas to find the circumference?

C=πd and C=2πr

400
If the radius is 13.6 ft, find the diameter.
17.2 ft
400

Find the radius, if the diameter is 13.5 in.

42.41 in

400

If the diameter is 16 in, find the area.

201.06 sq in

400
The circumference of a circle is 314 inches, find the diameter.
100 inches
500

What are all 3 circle formulas?

C=πd, C=2πr, and A = pi r squared

500
Given the diameter is 499.5 mm, find the radius.
249.75 mm
500

Given the circumference is 6.30 feet, find the diameter.

2 feet

500

If the diameter is 25 cm, find the area.

490.87 sq cm

500

If the circumference of a circle is 44 ft, find the area.

153.94 sq ft