Area of trapezoidal cross-section x length.
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To find the volume of a rectangular prism, multiply the base, width, and height. If the prism is irregularly shaped, multiply the base and the height.
area of base x height area of base x height
The volume of a three-dimensional figure is the amount of space it encloses. The volume V of a triangular prism is the product of the area B of a base and the height h of the prism. (The bases are triangles. In a special case of a right triangular prism the bases are right triangles)
Volume of rectangular prism: 3*4.5*6 = 81 cubic meters
I presume you mean a rectangular prism. Assuming all the angles are right angles, so that it is a rectangular parallelepiped, the volume is just the product of the three dimensions. I get 90.