algebra

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Solve. Leave the answers in terms of pi ?.
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

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