Help with finding the surface area?

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Help with finding the surface area?

Here's the question. Thank you for your answers.

The function V described by V(r)=4pir^2 gives the surface area of a sphere with radius r.

Find the surface area when the radius is 3 in.

2007-02-05 09:43:37 · 3 answers · asked by artistic_c 1 in Science & Mathematics ➔ Mathematics

3 answers

4 * pi * r * r

r = 3

4 * pi * 3 * 3

36pi = 113.1 in^2

2007-02-05 09:47:52 · answer #1 · answered by disposable_hero_too 6 · 0⤊ 0⤋

just put 3 in into the formula.
V=4*pi*3^2 in^2

2007-02-05 17:47:20 · answer #2 · answered by violentquaker 4 · 0⤊ 0⤋

V = 4*pi*(3)^2
V = 4*pi*9
V= 36pi
V = 113.04in^2

2007-02-05 17:48:04 · answer #3 · answered by 7 · 0⤊ 0⤋