3 because you need one for the base and two for the sides, you will also need two triangles for either end.
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Well, isn't a rectangular prism a geometric shape? And isn't a brick a rectangular prism? see this is one way that geometric shapes are used in architecture.
The answer depends mainly on the plane which is used to divide the prism.The result can be a rectangular prism (or a cube), a trapezoidal prism, a triangular prism, but to get really exotic shapes the cutting plane needs to be not parallel to any of the faces or diagonals of the prism.
The equation for the surface area of a rectangular prism is: A = 2lw + 2lh + 2wh Replace the variables you know, and solve for the remaining variable.
In general, the associative property cannot be used for this purpose. The volume of a prism is the area of cross section multiplied by the length, and except in the case of a rectangular prism, there is no scope for using the associative property.
Infinitely many. Every possible triangle can be used to generate a triangular prism, and in each case, the prism can have any one of infinitely many lengths.