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anonymous

  • 4 years ago

A cylindrical rod has a length of 73 cm and a diameter of 1.2 mm. What is the cross-sectional area in m^2?

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  1. anonymous
    • 4 years ago
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    pi*(d/2)^2 convert d to m 1.2 mm = 0.0012 m I think that's what they're asking

  2. anonymous
    • 4 years ago
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    note that d/2 is actually just r, the radius and pi*r^2 is the area of a circle

  3. anonymous
    • 4 years ago
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    i thought the answer was 1.13e-6?

  4. anonymous
    • 4 years ago
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    well how did you get that?

  5. anonymous
    • 4 years ago
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    .12 x pi / 4

  6. anonymous
    • 4 years ago
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    were you able to verify that somehow, because to me that looks incorrect

  7. anonymous
    • 4 years ago
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    no

  8. anonymous
    • 4 years ago
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    http://answers.yahoo.com/question/index?qid=20100204064536AAIBPm2

  9. anonymous
    • 4 years ago
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    oh yep that is correct, sorry. my blank was forgetting to divide the diameter by 2 in my calculation. even though i stated what to do properly above aha.

  10. anonymous
    • 4 years ago
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    a = pi(0.0012/2)^2 that is the formula I would use. So long as it makes sense to you

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