A metal feeding trough is in the shape of a triangular prism with one of the faces missing. The

base of the trough is an equilateral triangle with sides of length 3. 5 feet and a height of 4 feet.

If the trough is 15 feet long, how much metal was used to construct the trough?


66. 5 ft

119 ft

171. 5 ft

194 ft