Hello!
To find the surface area of a sphere you use the equation
[tex]A = 4 \pi r^{2} [/tex]
A is surface area
r is radius which is half the diameter
Put in the values you know
[tex]A = 4 \pi 6.25^{2} [/tex]
Square the number
[tex]A = 4 \pi 39.0625[/tex]
Multiply the 4 and the 39.0625
[tex]A = 156.25 \pi [/tex]
The answer is [tex]B) 156.25 \pi in^{2} [/tex]
Hope this helps!
