Posted by brianna on .
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,
Whoa. Use 3 as Pie?

8th grade math 
brianna,
yeah. that's what the ? says to use

8th grade math 
brianna,
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,
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,
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,
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,
hello anybody there? sorry it took so long to post a response, i was trying to figure it out

8th grade math 
brianna,
never mind i get it. Thanks for your help

8th grade math 
Anonymous,
5*5

8th grade math 
Jamarcus,
2/3 name all sets of numbers to which each real number belongs.