Hello!
To find the surface area of a cylinder you use the equation
[tex]SA = 2 \pi rh+2 \pi r^{2} [/tex]
SA is surface area
r is radius
h is height
Put in the values you know
[tex]SA = 2 \pi 9 * 3 + 2 \pi 9^{2} [/tex]
Square the number
[tex]SA = 2 \pi 9 * 3 + 2 \pi 81 [/tex]
Times the 9 and 3
[tex]SA = 2 \pi 27 + 2 \pi 81[/tex]
Multiply the 2 and 27
[tex]SA = 54 \pi + 2 \pi 81[/tex]
Multiply the 2 and 81
[tex]SA = 54 \pi + 162 \pi[/tex]
Add
[tex]SA = 216 \pi[/tex]
The answer is [tex] 216 \pi [/tex]
Hope this helps!
