We have been given a triangular prism. We are asked to find the volume of a prism that is 3 times as large.
The sides of base of triangular prism and height of new prism would be 3 times the sides and height of original prism.


We can see that base of prism is a right triangle, so base length will be 9 and height of triangle will be 9 as well.



Volume of prism would be base area times height of prism.



Therefore, the volume of the prism that is 3 times as large as given prism would be 607.5 and option D is the correct choice.