Answer:
A. 1008 square inches
Explanation:
You want the lateral area of a triangular prism with base edge lengths 10 in, 10 in, and 8 in, and a height of 36 in.
Lateral area
The lateral area of the prism is the area of the three rectangular sides. The area of each rectangle is the product of its length and width. All have the same length, so we can sum the widths before multiplying:
LA = Pl
LA = (10 in + 10 in + 8 in)(36 in) = 28·36 in² = 1008 in²
The lateral surface area of the prism is 1008 square inches.