Answer:
A. 324 units³
Explanation:
You want the volume of a triangular prism with triangle base 9 units, triangle height 4 units, and prism length 18 units.
Volume
The volume of the triangular prism is the product of its base area and its length:
V = Bl
The base area is the area of a triangle.
B = 1/2bh
Then the volume of the prism is ...
V = (1/2bh)l = 1/2(bhl) = 1/2(9)(4)(18) = 324 . . . . cubic units
The volume of the triangular prism is 324 units³.
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Additional comment
You will note that this is half the volume of a rectangular prism with the same overall dimensions.
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