The answer depends on what measurements you do have.
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The ends of a triangular prism are triangles. The volume of a triangular prism = 1/2 b x h x l, where 1/2 b x h is the area of the triangle, and l is the length of the prism.
The volume of any prism is worked out in the same way whether it's a hexagonal prism, circular prism or a triangular prism. You just need to times the length of the prism against the area of the cross-section.
Mass = Density x Volume
V = base area × height
A triangular prism can be thought of as a stack of triangles. Then the volume is equal to the area of the triangular base multiplied by the height of the prism, or 1/2 length * width * 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)