8th grade math

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The radius of circle M is 3 times the radius of circle P. If the area of circle P is abotu 27 sq. cm. the area of circle M is about what? (Use 3 as pie) i don't get it. is the scale ratio 3:1?

  • 8th grade math -

    Whoa. Use 3 as Pie?

  • 8th grade math -

    yeah. that's what the ? says to use

  • 8th grade math -

    i thought the scale ratio would be 3:1 because of the fact that the question says that the bigger circle is 3 times as big as the little one

  • 8th grade math -

    it the radius of M is 3x the radius of P, then the area is 9x (remember area is proportional to radius squared).
    So, if P is 27, then M is 27*9

  • 8th grade math -

    Hmm.. Since the radius is 3 times larger than P, its diameter should be 18. P's diameter should be 6.

    That might help you solve the problem.

  • 8th grade math -

    ok, but how would you get that into a proportion. i get the rest of the question, just not how to put those # into a scale ratio

  • 8th grade math -

    hello anybody there? sorry it took so long to post a response, i was trying to figure it out

  • 8th grade math -

    never mind i get it. Thanks for your help

  • 8th grade math -

    5*5

  • 8th grade math -

    2/3 name all sets of numbers to which each real number belongs.

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