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The surface area of a sphere is found using the formula SA=4πr^2, where r is the radius. If the surface area of a sphere is 64π square feet, what is the radius, in feet? A. 3 B. 18 C. 1 D. 4

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bestrongtroopsp3i7sm
The answer should be d
64pi=4pir^2
cancel the pi
64=4r^2
16=r^2
r=4
[tex]SA = 4 \pi r^{2}[/tex]
[tex]64 \pi = 4 \pi r^{2}[/tex]
[tex]16= r^{2}[/tex]
[tex]r^{2}=16[/tex]
 [tex]r=4 [/tex] (Answer D)

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