Iwill give find the serface area of the cylinder in terms of pi. height = 12 in diameter = 6 in a. 216 (pi) in^2 b. 144 (pi) in^2 c. 432 (pi) in^2 d. 168 (pi) in^2

None of the given answers are correct.  To find the surface area you will find the areas of each circular base by using the formula for area of a circle.  

To find the area of the circular height, you will find the circumference of the circle and multiply by the height.

SA = 2(pi x r^2) + pi x d x h
        2 x pi x 3^2 + pi x 6 x 12
        18pi + 72pi
SA = 90pi.

The surface area would be 90 pi square inches.