Circle Vocab
Finding Radius or Diameter
Finding Circumference (round to hundredths)
Finding Area (round to tenths)
Finding Radius/Diameter given Circumference (round to whole number)
100

The distance from the center of a circle to the outside, also half of the diameter

What is radius

100

The radius of this circle is 3

What is d = 6

or

the diameter is 6

100

The radius for this circle is 8

What is C = 50.27

or

the circumference is 50.27

100

The radius for this circle is 6

What is A = 113.1

or

the area is 113.1

100

The radius of a circle with a circumference of 

6pi

What is r = 3

200

A straight line passing from side to side through the center of a circle.

What is the diameter

200

The diameter of this circle is 16

What is r = 8


or

the radius is 8

200

The radius for this circle is 13.5 m

What is C = 84.82 m

or

the circumference is 84.82 m

200

The radius of this circle is 2.5 ft

What is A = 19.6 ft^2

or

the area is 19.6 ft^2

200

The radius of a circle with a circumference of 

17pi

What is r = 8.5

or

the radius is 8.5

300

The distance around the outside of a circle.

What is circumference

300

The radius of this circle is 10 cm

What is d = 20 cm

or

the diameter is 20 cm

300

The diameter of this circle is 12

What is C = 37.70

or

the circumference is 37.70

300

The diameter of this circle is 17 m

What is A = 227.0 m^2

or

the area is 227.0 m^2

300

The diameter of a circle with a circumference, in meters, of 

21pi 

What is d = 20 meter

or

the diametere is 20 meters

400
The total amount of space inside of a circle
What is the area?
400

The diameter of this circle is 45 m

What is r = 22.5 m

or

the radius is 22.5 m

400

The diameter for this circle is 45 in

What is C = 141.37 in

or

the circumference is 141.37 in

400

The radius of this circle is 18.84 ft

What is A = 1,115.1 ft^2

or

the area is 1,115.1 ft^2

400

The diameter of a circle with a circumference, in ft, of 

18.5pi

What is d = 18.5 ft

or

the diameter is 18.5 ft

500

pi

is approximately equal to this number rounded to the nearest hundredths

What is 3.14

500

The diameter of this circle is 5.27 ft

What is r= 2.85 ft

500

The radius for this circle is 25.7 cm

What is C = 80.74 cm

or

the circumference is 80.74 cm

500

The diameter of this circle is 15.2 in

What is A = 181.5 in^2

or

the area is 181.5 in^2

500

The diameter of a circle is with a circumference of 18.85 cm

What is d = 6 cm

or

the diameter is 6 cm