To find the volume of a triangular prism, you can find the area of the base triangle, and multiply that value by the height of the prism.
So let's first find the area of the base triangle (which is its base times height, divided by 2):
[tex]\frac{b \times h}{2} = \frac{4.5\times3}{2} = \frac{13.5}{2} =6.75[/tex]
Then, multiply this value by the height of the prism, which will give you the prism's volume:
[tex]6.75 \times 9=60.75[/tex]
Your answer is 60.75 miles³, or option 2.
