SOLUTION: A balloon has a circumference of 28 in. Use the circumference to approximate the surface area of the balloon to the nearest square inch.

Algebra ->  Surface-area -> SOLUTION: A balloon has a circumference of 28 in. Use the circumference to approximate the surface area of the balloon to the nearest square inch.       Log On


   

Question 982676: A balloon has a circumference of 28 in. Use the circumference to approximate the surface area of the balloon to the nearest square inch.
Found 2 solutions by Alan3354, Cromlix:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A balloon has a circumference of 28 in. Use the circumference to approximate the surface area of the balloon to the nearest square inch.
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Find the radius.
SA+=+4pi%2Ar%5E2

Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there,
Using Surface Area = 4 x pi x r^2
Circumference = 2 x pi x r
28 = 2 x pi x r
28/2 x pi = r
radius = 4.5ins
Surface Area = 4 x pi x 4.5^2
Surface Area = 254.5 ins^2
Surface Area = 255 ins^2 (to nearest square inch)
Hope this helps:-)