Posted by brianna on Monday, January 5, 2009 at 5:48pm.
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  Don, Monday, January 5, 2009 at 5:49pm
Whoa. Use 3 as Pie?

8th grade math  brianna, Monday, January 5, 2009 at 5:51pm
yeah. that's what the ? says to use

8th grade math  brianna, Monday, January 5, 2009 at 5:54pm
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  bobpursley, Monday, January 5, 2009 at 5:57pm
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  Don, Monday, January 5, 2009 at 5:59pm
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  brianna, Monday, January 5, 2009 at 6:19pm
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  brianna, Monday, January 5, 2009 at 6:22pm
hello anybody there? sorry it took so long to post a response, i was trying to figure it out

8th grade math  brianna, Monday, January 5, 2009 at 6:25pm
never mind i get it. Thanks for your help

8th grade math  Anonymous, Monday, January 12, 2009 at 4:19pm
5*5

8th grade math  Jamarcus, Thursday, September 13, 2012 at 9:40pm
2/3 name all sets of numbers to which each real number belongs.
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