You need to repaint the floor and inside wall of your circular swimming pool. It has a diameter of 16 feet and a depth of 5 feet. What is the surface area that needs to be repainted? (Use 3.14 for π.)

1,055.04 ft2
251.2 ft2
401.92 ft2
452.16 ft

Question

You need to repaint the floor and inside wall of your circular swimming pool. It has a diameter of 16 feet and a depth of 5 feet. What is the surface area that needs to be repainted? (Use 3.14 for π.) 



1,055.04 ft2
251.2 ft2
401.92 ft2
452.16 ft

stamp · Answer

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stamp · Answer

Unfolding the side panel forms a rectangle, what is the value of x|dw:1365106584923:dw|

anonymous · Answer

i would rather work it out in the formula way. 2 times pi times radius times height plus 2 times pi times radius^2

anonymous · Answer

I plugged in my answers but i didnt get the right answer because the answer i got wasnt one of the multiple questions

stamp · Answer

x in the picture is the circumference of the pool.

pi = C / d, C = pi*d

d = 18', C = pi*18'

C = 18pi'

stamp · Answer

So the area of the panel (unfolded) is x'*5', or 

18pi'*5' = 90pi square feet

Now what about the floor of the pool? Find a|dw:1365107288864:dw|

stamp · Answer

Lol ok so you could have stopped me when you saw I was using 18' for diameter instead of 16'

anonymous · Answer

Im sorry. i just relized you were.

stamp · Answer

Area of the unfolded panel is going to be 16pi*5 = 80pi sq ft

floor's A(r) = pi*8'*8' = 64pi sq ft

so 80pi + 64pi = 144pi sq ft

144*3.14 =

anonymous · Answer

452.16 and sorry i didnt get a chance to work it out. i went back to other page to make sure it didnt time out.

anonymous · Answer

But thank you for explaining and showing me the steps to get the right answer:)