Answer:
Total surface area = 468 in.²
Step-by-step explanation:
Total surface area of triangular prism = 2BA + PH
Base area (BA) = ½*bh
b = 9 in.
h = 12 in.
2BA = 2(½*9*12) = 108 in.²
Perimeter of base (P) = 9 + 12 + 15 = 36 in.
Height of prism (H) = 10 in.
Plug in the values
Total Surface area of triangular prism = 108 + 36*10 = 468 in.²
