Find the area of the two bases.
Find the area of each lateral face.
Add all the face areas together.
Use the formula: Surface Area = 2B + Ph
B = area of the base
P = perimeter of the base
h = height of the prism
For a rectangular prism: SA = 2lw + 2lh + 2wh
For a triangular prism: SA = 2(base area) + (perimeter of triangle)(length of prism)
Make sure all measurements use the same units
Write the final answer in square units