The surface area of the triangular prism is 243 inches squared.
How to find the surface area of a triangular prism?
The surface area of a triangular prism can be found as follows:
surface area of triangular prism = bh + pl
where
- b = base of the triangle
- h = height of the triangular base
- p = perimeter of the triangle
- l = height of the prism
Therefore,
surface area of triangular prism = 6 × 4.5 + 12(6 + 4.5 + 7.5)
surface area of triangular prism = 6 × 4.5 + 12(18)
surface area of triangular prism = 27 × 216
surface area of triangular prism = 243 inches²
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