posted by Cara .
What is the formula for finding the surface area of a right rectangular prism? (ex: The base of a right rectangular prism is 10 ft by 7 ft. The height is 3 ft. Find the surface area)
The total surface area of a rectangular prism is
2(ab + ac + bc)
where a, b and c are the three side lengths.
It would be 2(70 + 30 + 21) = 242 ft^2 for the figure you describe.