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December 18, 2014

December 18, 2014

Posted by **Anna** on Saturday, July 21, 2012 at 10:10am.

a)Find a polynomial for the sum of the areas of the circles shown in the figure.

b)Find the sum of the areas when r = 5 and r = 11.3.

this is what I got but I did not do it right. I needed to To write an expression for the sum, i need to put everything together by adding the three terms that i wrote below but not sure how to start.

(pi*r2)+(pi*r2)

(pi*52)+(pi*11.32)

(25pi)+(127*69pi)

(152.69pi)

Large circle: A=pi*r2, Medium circle A=pi*32, Small circle A=pi*22

- algebra -
**Reiny**, Saturday, July 21, 2012 at 10:25amAnna, I saw this post yesterday, and hoped you would realize that you can't post figures or pictures, so we can't see " the circles shown in the figure".

Do you have 2 separate circles, not overlapping ?

if so, then

for r=5 , area = π(5^2) = 25π

for r = 11.3, area = π(11.3^2) = 127.69π

so the total area = 25π + 127.69π = 152.69π

You seem to have that answer.

btw, to show exponents use the ^ key

e.g. 5^2 = 25

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