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

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

- algebra -
**Reiny**, Saturday, July 21, 2012 at 10:25am
Anna, 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

## Answer This Question

## Related Questions

- algebra - Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the...
- math gre question - in an infinite series of circles the radius of the second ...
- Calc - A 100 inch piece of wire is divided into 2 pieces and each piece is bent ...
- math URGENT!!!!!! - a 12x12-inch square is divided into n^2 congruent squares by...
- calc and Vectors - A wire 60 cm long is to be cut into two pieces. One of the ...
- Math - A classroom in a college is 15m long and 12m broad. If the sum of the ...
- math - 2) In the given figure, AB || CD and 4DC = AB. If the area of ABCD is 75 ...
- math URGENT!!!!!!!!!!!! - a 12x12-inch square is divided into n^2 congruent ...
- Further mathematics - An exponential sequence (GP)of positive terms and a linear...
- Maths - I am very greatefull to you if you guide me to solve this problem. Two ...

More Related Questions