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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  2. 👎 5
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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
  2. Sooooo Theres No Answer

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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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