Use a net to find the surface area of the right triangular prism shown below:
Not sure what a 'net' is...but here is a way to calc the area:
The central portion is a long rectangle 7 x (10+10 +6) = 182 ft^2
Then there are two rt triangles 2 * 1/2 * 6 * 8 = 48 ft^2
Total = 230 ft^2