Circle Terms
Circle Formulas
Finding Diameter (Find Diameter for all)
Finding Circumference(Find Circumference for all)
Finding Area
(Find area for all)
100
The distance from the center of a circle to the outside, also half of the diameter
What is radius
100

The Circumference formula when given the radius

What is 2(pi)r

100
The radius of this is 5
What is 10
100
The diameter for this circle is 10
What is 31.4
100
The radius of this circle is 2
What is 12.56
200

From one side of the circle, through the middle, to the other side of a circle

What is the Diameter

200

The Circumference formula when given the diameter

What is (pi)d

200
The radius of this circle is 2.5
What is 5
200
The diameter for this circle is 13
What is 40.82
200
The radius of this circle is 3
What is 28.26
300

Two times the radius

What is the diameter?

300

The area of a circle when given the radius

What is (pi)r2

300
The circumference of this circle is 15.7
What is 5
300
The diameter of this circle is 25
What is 78.5
300
The radius of this circle is 21
What is 1384.74
400
The total amount of space inside of a circle
What is the area?
400

The area formula when given the diameter

What is (pi)(diameter/2)2

400
The circumference of this circle is 18.84
What is 6
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
500
3.14 or 22/7
What is pi?
500

The "parts" of a circle that divide by one another to equal (pi)

What is circumference divided by the diameter

500
The diameter of this circle is 194.68
What is 62
500
The Diameter for this circle is 3285
What is 10314.9
500
The radius of this circle is 6955
What is 151888158.5
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