Circle Terms
Finding Radius
or Diameter
Finding Circumference
Finding Area
Challenge Questions
100

A line segment that goes from the center to the edge of a circle.

Radius

100

The radius of this circle is 3 cm

6 cm

100
The diameter for this circle is 10
What is 31.4
100
The radius of this circle is 2
What is 12.56
100

True or False: The following are units of area: Feet, Inches, Meters

False. Area Units Need to be Squared

200

A line that goes from one edge of a circle to the other and passes through the center

Diameter

200

The radius is 5.5 in

11 in

200
The diameter for this circle is 13
What is 40.82
200
The radius of this circle is 3
What is 28.26
200

The radius of a circle is 2.5 cm. What is the circumference of half the circle. 

7.85 cm2

300

The distance around the circle

Circumference?

300

The diameter of this circle is 27 meters

13.5 meters

300
The diameter of this circle is 25
What is 78.5
300
The radius of this circle is 21
What is 1384.74
300

The circumference of a circle is 37.68 feet. What is the diameter?

12 feet

400

The total amount of space inside of a circle

Area?

400

The diameter of this circle is 437 feet

218.5 feet

400
The radius for this circle is 45
What is 282.6
400
The radius of this circle is 52.4
What is 8621.6864
400

The area of a circle is 78.5 squared meters. What is the radius?

5 meters

500

What is pi?

3.14 or 22/7

500

The diameter of this circle is 0.325

0.1625

500
The Diameter for this circle is 3285
What is 10314.9
500
The radius of this circle is 6955
What is 151888158.5
500

Circle A has a circumference of 34.54 feet. Circle B has an Area of 314 ft2. Which circle has a larger radius?

Circle A

M
e
n
u