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Earn +20 ptsQ: What is pi r r?
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What is the diameter of a circle with a circumference of 27.5 inches?
The circumference of a circle is 2*Pi*R (Pi~3.14) so: 2*Pi*R = 27.5 Pi*R = 13.75 R = 4.37 cm
If the circumference of the circle is 1200 what is the radius?
C = 2 pi r so pi r = 600 so r = 600/pi
Is 2Pi r the same as Pi r squared?
No. 2Pi r is equal to Pi d, though.
What is the formula of a semicircle in perimeter?
The perimeter of a semicircle with radius R is pi*R + 2*R = R*(pi + 2)
What happens to the area of a circle when the radius is tripled?
The area of the circle becomes 9 times the area of the original circle. Original circle = Pi * (r ^ 2) = Pi * r * r New Circle = Pi * ((3 * r) ^ 2) = Pi * 9 * r * r
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