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Mathematics 8 Online
OpenStudy (anonymous):

prolly easy.. but idk.. :o If a tennis ball has a diameter of approximately 6.9 centimeters, what is its surface area?

OpenStudy (anonymous):

Whats the formula for the surface area of a sphere?

OpenStudy (anonymous):

4pi*r^2?

OpenStudy (anonymous):

i don't see anything wrong with that formula... plug it in danny....

OpenStudy (anonymous):

i got 149.63 what did i do wrong :o?

OpenStudy (anonymous):

hmm.... 4*3.14*(6.9)*(6.9) try that one...

OpenStudy (anonymous):

598.45?

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