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For more information, please see full course syllabus of SAT: Mathematics

For more information, please see full course syllabus of SAT: Mathematics

0 answers

Post by Myat Kyu on October 19, 2015

Hi, for the second question (concentric circles), given the center of the circles, shouldn't the radius of the bigger circle be r1+r2? I don't understand how you got area of bigger circle = pi*r2^2, I believe the answer should be pi*(r2+r1)^2 - pi*r1^2.

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Post by Peter Ke on October 10, 2015

How did you get r2= 3? I don't see you solving that.

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Post by Enrique Salinas on June 21, 2014

i have one question on the first example about circles, were trying to find the area of circle two, but i cant figure out how you got 2/3r2+3/3r2=5/3r2=5 and then after your multiply it you said that r2=3 can you please explain to me how you got those answers?

1 answer

Last reply by: Professor Vilkus

Tue Jul 8, 2014 9:57 AM

Post by Enrique Salinas on June 19, 2014

i have one question on the first example about circles, were trying to find the area of circle two, but i cant figure out how you got 2/3r2+3/3r2=5/3r2=5 and then after your multiply it you said that r2=3 can you please explain to me how you got those answers?