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 (7)(18) + 2 \pi * 7^{2} [/tex]
Square the number
[tex]SA = 2 \pi (7)(18) + 2 \pi * 49[/tex]
Multiply 7 and 18
[tex]SA = 2 \pi * 126 + 2 \pi * 49[/tex]
Multiply 126 by 2
[tex]SA = 252 \pi + 2 \pi * 49[/tex]
Multiply the 49 by 2
[tex]SA = 252 \pi + 98 \pi [/tex]
Add
[tex]SA = 350 \pi [/tex]
The answer is [tex]A)350 \pi cm^{2} [/tex]
Hope this helps!
