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Earn +20 ptsQ: What is the area of a circle that has a four inche radius?
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Does the area of a circle equal pi?
no, the area of a circle equals pi times the radius squared or circumference times diameter over four.
How do you find the area of a circle only knowing the radius?
If you know the radius (say it's 4), square the radius and multiply that number by pi. So for a radius of four, it would be 4 X 4 = 16 X 3.14 = 50.24, the area of the circle.
What fraction of the area of a circle of radius 5 lies between concentric circles of radius 3 and 4?
The area of a circle with radius 5 is 25 pi. Concentric circles with radius 3 and 4 have areas of 9 pi and 16 pi. The concentric circle with radius four consumes the circle with radius 3. 25 pi minus 16 pi leaves 9 pi of the circle with radius 5 left over. 16 pi is slightly over three-fifths of the circle with radius 5.
What is the area of a circle with the radius of four feet?
It is: pi*42 = 50.265 square feet to 3 dp
Cicumference of a four foot circle?
I'm sorry the question isn't clear enough. A four foot diameter? radius? area?
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