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Circle Terms
Finding Radius
(find the radius for all)
Finding Diameter
Finding Circumference
Finding Area
(Find area for all)
100
The distance from the center of a circle to the edge, also half of the diameter
What is radius
100
The diameter of this circle is 5 mm
What is 2.5 mm
100
The radius of this circle is 5 in
What is 10 in
100
The diameter for this circle is 10 in
What is 31.4 in
100
The radius of this circle is 2 yds

What is 12.56 yds2

200
The distance across a circle that passes through the center and has endpoints on the edge of the circle
What is the Diameter
200
The diameter of this circle is 12 m
What is 6 m
200
The radius of this circle is 2.5 yds
What is 5 yds
200
The diameter for this circle is 13 ft
What is 40.82 ft
200
The radius of this circle is 3 in

What is 28.26 in2

300
The distance around a circle
What is circumference
300
The diameter of this circle is 27 cm
What is 13.5 cm
300
The radius of this circle is 15.7 cm
What is 31.4 cm
300
The diameter of this circle is 25 in
What is 78.5 in
300
The radius of this circle is 21 ft

What is 1,384.74 ft2

400
The total amount of space inside of a circle
What is the area
400
The diameter of this circle is 437 km
What is 218.5 km
400
The radius of this circle is 18.84 in
What is 37.68 in
400
The radius for this circle is 45 cm
What is 282.6 cm
400
The radius of this circle is 52.4 cm

What is 8,621.6864 cm2

500

3.14 or π

What is pi
500
The diameter of this circle is 0.325 mi
What is 0.1625 mi
500
The radius of this circle is 194.68 ft
What is 389.36 ft
500
The radius for this circle is 3,285 mm
What is 20,629.8 mm
500
The diameter of this circle is 12 mi

What is 113.04 mi2