Draw a straight line segment connecting two opposite corners of one of the rectangular faces (a diagonal).
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This depends on whether or not the prism is a rectangular prism or not. Simple shape prisms (rectangular, triangle, octagonal, hexagonal) all have rectangular faces.
A triangle on each end.
No. It is a parallelopiped. And, if it is a right rectangular prism then it is a cuboid.
They both have sides that are rectangular in shape. They both have a constant cross-sectional shape equal to the shape of the ends (triangle for a triangular prism; rectangle for a rectangular prism).
Divide the shapes, so you're left with a triangular prism, and a rectangular prism. Calculate the slope of the triangle as per usual.