V = L*b*h/2
Where V is volume, L is the length of the prism, b is the base of the triangle, and h is the height of the triangle.
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A trianglular prism is made up of triangles and rectangles, so its net must have the same shapes.
Like you would a regular prism.
A triangular prism has 6 vertices. A pyramid whose base is a polygon with n sides (n > 2) has n+1 vertices. So the answer is 5 - n more vertices. Incidentally, this shows that a pentagonal based pyramid (n = 5) has the same number of vertices as a triangular prism.
Measure, then multiply(length of the prism) x (width of the prism) x (height of the prism) .The product of the three dimensions is the volume of the prism.
A prism is a solid geometric object. If you know its shape and dimensions you can calculate its volume.