Anonymous
Anonymous asked in Science & MathematicsMathematics · 4 weeks ago

Find the radius of a circle with a circumference of 64 pi inches.?

How do you get that so I can jot down for future reference. I know the A= pi r^2 but cant get this one.

8 Answers

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  • 4 weeks ago
    Best Answer

    Circumference = 2🥧r (sorry, I can’t do pi on my iPhone and I didn’t want you to confuse it as p*i).

    64🥧 = 2🥧r

    r = 32

  • Como
    Lv 7
    4 weeks ago

    -

    C = 2 π r

    2 π r = 64 π

    r = 32 ins

  • Anonymous
    4 weeks ago

    c = 2πr

    64π = 2πr

    Cancel π

    64 = 2r

    32 = 1r

    r = 32

    Source(s): Been there
  • alex
    Lv 7
    4 weeks ago

    circumference C=2πr

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  • 4 weeks ago

    C = 2 pi r

    2 pi r = 64 pi inches

    r = 32"

  • Anonymous
    4 weeks ago

    C = 2 pi R

    C = pi D

    pi = 3.14

    pi = 22/7

    Substitute given values into equation

    64 = 2 X 3.14 X R

    64/ 6.28 = R

    10.19 = R

    The radius is 10.19 inches

    You can also use estimation to get you in the right ballpark

    Circumference is about 6 times the length of the radius or about 3 times the diameter

  • 4 weeks ago

    d = circ/pi = D 20.38 divided by 2 = r 10.19

    • Φ² = Φ+1
      Lv 7
      4 weeks agoReport

      "d = circ/pi = D 20.38 divided by 2 = r 10.19" — How does 64π / π = 20.38 ?

  • Bill
    Lv 7
    4 weeks ago

    Circumference = pi*d.

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