Math

The area of a circle is 78.5 square feet. What is the circumference? Select all that apply.

5 π feet

10 π feet

20 π feet

15.7 feet

31.4 feet

62.8 feet

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1. None of them apply, unless the area was 78.5𝝿 ft^2
area = 𝝿r^2 = 78.5
r^2 = 78.5/𝝿
r = √(78.5/𝝿) = 4.99
2r = 5 , not 5𝝿

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Reiny

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3. Not the way you typed it. I gave you an "unless"

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Reiny
4. If r=5, then C = 10π = 31.4

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oobleck
5. thanks for the catch ooblek
messed up in my last line, should have been
2r = 10
so C = 10π , like you had

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Reiny
6. Which describes the collection of all points in the same plane that are
8
1
2

812
inches from Point T?
The area of a circle is 78.5 square feet. What is the circumference? Determine which pizza is the better buy: A 10-inch diameter pizza for \$8.99 or a 6-inch diameter pizza for \$5.A circular marble tabletop has a diameter of 42 inches. If the tabletop costs \$280, what is the price per square inch?

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7. What’s the area of 64 mi squared?

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