## penberth Group Title What is the surface area of a sphere with radius of 3.5? A. 12.25p B. 14p C. 24.5p D. 49p 2 years ago 2 years ago

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1. Tomas.A

do you know formula for calculating surface area of a sphere?

2. penberth

yes but I keep getting 153.94

3. Tomas.A

In all answers there are p, so I guess its $$\pi$$? So you should not write 3.14 instead of it but just keep it.

4. penberth

this is due today and I have no idea what you just said

5. Tomas.A

write down formula of sphere for me

6. penberth

4 pi r 2

7. Tomas.A

ok so $S=4\pi r^2=4\pi3.5^2=4\pi12.25=49\pi$ and taht's your answer, its D you don't need to use 3.14 instead of $$\pi$$ because no one asked you. 3.14 is just approximation of $$\pi$$ and for math you need the most accurate result.

8. penberth

thanks but I found it on yahoo answers

9. Tomas.A

do you understand why its not 153.94?

10. penberth

no but who cares