Diameter
Radius
Area
Circumference
Circles in Real Life
100
The radius of a circle is 2 cm. What is it's diameter?
4 cm
100
The diameter of a circle is 18 inches. What is its radius?
9 in.
100
What is the formula for area of a circle?
A=π r2
100
What is the formula for circumference of a circle?
C=π d
100
A runner runs a circular lap around a park. The distance from one side of the park to the other is 1 mile. What distance did the runner travel around the entire park?
3.14 miles.
200
The radius of a circle is 3.2 inches. What is its diameter?
6.4 in
200
The diameter of a circle is 15 cm. What is the radius of the circle?
7.5 cm
200
A circle has a radius of 3 in. What is it's area?
28.26 in2
200
Find the circumference.
21. 98 in
200
Antone wants to craft a circular dog bed for Lili. The diameter of the bed is 2 feet. How much space will Lili's dog bed take up?
3.14 feet2
300
A circle has a circumference of 11π ft . What is the diameter?
11 ft
300
A circle has an area of 16π in2. What is its radius?
4 in
300
Find the area. 
153.86 in2
300
What is the circumference? (round to the nearest hundredth)
39.88 m
300
A Chuck E Cheese token has a radius of 2 cm. The length of a token slot on a new game 3 cm. Will the Chuck E Cheese token fit in the new game? Explain.
No
400
A circle has a circumference of 314 mm. What is the diamter?
100 mm
400
A circle has an circumference of 314 mm. What is the radius?
5 mm
400
Find the area.
50.24 cm2
400
Find the circumference. 
21.98 cm
400
Will the circumferences of Circle 1 and Circle 2 be proportional? Explain.
Yes
500
A circle has an area of 9π ft2. What is the diameter?
6 ft
500
A circle has an area of 1,256 ft2. What is the radius of the circle?
20 ft
500
A circle has a circumference of 31.4 cm. What is the area?
78.5 cm2
500
A circle has an area of 1,256 ft2. What is the circumference of the circle?
62. 8 ft
500
The Earth has an estimated circumference of
24, 860.95 miles. What is the Earth's radius?
3,958.75 mi