Answer:
256 square feet
Explanation:
To find the surface area, find the area of each surface of the prism.
The triangles are A = 1/2bh. Substitute b = 12 and h = 8.
A = 1/2*12*8 = 48
Together the two triangle face is 96 square feet.
The prism also has two identical prism surfaces whose ares are found using A =b*h. Substitute b = 5 and h = 10. A = 5*10 = 50. The two faces together are 100.
The last surface face of the prism has area with b = 5 and h = 12. The area is A = 5*12 = 60.
The surface area of the entire prism is 96 + 100 + 60 = 256.