Answer and Step-by-step explanation:
The lateral surface area of the triangular prism will be 84 square feet. Then the correct option is D.
What is the surface area of the triangular prism?
Let the sides of the triangle be a, b, c, and a height of H. Then the surface area of the prism is given as
SA = H(a + b + c)
A triangular prism has bases with three congruent sides, each measuring 4 feet.
The height of each triangle is approximately 3.5 feet.
The distance between the triangular bases is 7 feet.
Then the lateral surface area will be
SA = 7 (4 + 4 + 4)
SA = 7 x 12
SA = 84 square feet
Then the correct option is D.