Answer:
Surface area = 144 mi.²
Step-by-step explanation:
Surface area of the triangular prism = bh + (P)L
Where,
b = base of triangular base = 6 mi.
h = height of triangular base = 8 mi.
P = Perimeter of triangular base = 10 + 8 + 6 = 24 mi.
L = height of the prism = 4 mi.
Plug the values into the formula
Surface area = 6*8 + (24)4
= 48 + 96
= 144 mi.²
