MATH

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Find the area of a circle with the given radius or diameter. Round your answer to the nearest tenth.

Diameter = 42.0 mm

  • MATH -

    A = pi * r^2

    A = 3.14 * 21^2

    A = 1,384.7 sq. mm

  • MATH -

    radius = 42.0/2 = 21.0
    A = pi r^2
    = 3.14159 * 21 * 21
    round answer to nearest tenth

  • MATH -

    Never Mind!

    Don't Answer this question!

  • MATH -

    to square 21:
    (20+1)(20+1) = 400 + 40 + 1 = 441

  • MATH -

    Oh well :(

  • MATH -

    OK, Thanks!

    Ms. Sue and Damon!

    But I already got the answer!

    It was 1,384.7

  • MATH -

    You guys are very kind! :)

  • MATH -

    You are welcome :)
    be sure you want mm^2, usually that would be converted to cm^2 or m^2

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