Answer:
6in²
Explanation:
the problem says the two triangular prisms are congruent.
the first triangle's volume is 90in³ and the height of the second triangular prism is 15. we use the formula fro the volume of the shape:
V=B * h
we substitute the values we know:
90in³=B*15
90/15 = B
6in²= B
So the area of the base is 6in²
Hope this helps :)