First, find the length of triangle (Phytagoras Theorem) :
l(t)² = h² - w(a)²
l² = 16,25² - 8,25²
l² = 264,0625 - 68,0625
l² = 196
l = √196
l = 14 m
Note : h = hypotenuse
Then, find the Volume :
V = AΔ × h
= (½ × 8,25 × 14) × 16
= 57,75 × 16
= 924 m³
So, the volume of a triangular prism is 924 m3
Hope it helpful and useful :)