Answer: 221.4 m³ If you are just looking for the volume of the triangular prism.
Step-by-step explanation: Volume of the prism is the Area of the base times the height.
The Area of the triangular base = width × height ÷ 2
Width = 12m height = 4.1m = 49.2m Divided by 2 =
24.6m² is the Area of the base
The height of the base is 9m
24.6 × 9 = 221.4 cubic meters