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penberth

  • 3 years ago

What is the surface area of a sphere with radius of 3.5? A. 12.25p B. 14p C. 24.5p D. 49p

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  1. Tomas.A
    • 3 years ago
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    do you know formula for calculating surface area of a sphere?

  2. penberth
    • 3 years ago
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    yes but I keep getting 153.94

  3. Tomas.A
    • 3 years ago
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    In all answers there are p, so I guess its \(\pi\)? So you should not write 3.14 instead of it but just keep it.

  4. penberth
    • 3 years ago
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    this is due today and I have no idea what you just said

  5. Tomas.A
    • 3 years ago
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    write down formula of sphere for me

  6. penberth
    • 3 years ago
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    4 pi r 2

  7. Tomas.A
    • 3 years ago
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    ok so \[S=4\pi r^2=4\pi3.5^2=4\pi12.25=49\pi\] and taht's your answer, its D you don't need to use 3.14 instead of \(\pi\) because no one asked you. 3.14 is just approximation of \(\pi\) and for math you need the most accurate result.

  8. penberth
    • 3 years ago
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    thanks but I found it on yahoo answers

  9. Tomas.A
    • 3 years ago
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    do you understand why its not 153.94?

  10. penberth
    • 3 years ago
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    no but who cares

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