Area of a Circle
Circumference of a Circle
Diameter and Radius
Random
100

What is the formula for the area of a circle?

A=pi x r2

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What is the formula for circumference of a circle?
Pi x d
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If you are given the radius, how can you find the diameter?
Multiply radius by two
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What numerical value is used for pi in the equation for area and circumference of circles?
3.14
200
What is the area of a circle with a radius of 15 cm?
706.5 cm
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What is the circumference of a circle with a diameter of 14.8 cm?
46.5 cm
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If given the diameter, how can you find the radius?
Divide the diameter by two
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What is the relationship between the radius and diameter of a circle?
Radius is half the diameter. OR Diameter is two times the radius
300
What is the area of circle with radius 39 cm?
1194 cm
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What is the circumference of a circle with a diameter of 41.3 cm?
129.7 cm
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If a circle has a radius of 15 cm, what is the diameter?
30 cm
300
Is the exponent, 2, used in the answer for area or circumference of a circle?
Area
400
What is the area of a circle with diameter 24.8 in?
482.8 in
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What is the circumference of a circle with a radius of 19.7cm?
123.7 cm
400
If a circle has a diameter of 31 ft, what is the radius?
15.5 ft
400
What is the diameter of a circle if the circumference is 78.5 ft?
25 ft
500
What is the area of a circle with diameter 23.78 in?
443.9 in
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What is the circumference of a circle with radius 23.25 in?
146 in
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A circle has a circumference of 62.8 ft, what is the diameter?
20 ft
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What are two ways we can write the formula for circumference of a circle?

Pi x d OR 2Pi x r

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