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A triangular prism has a triangular cross-section. A rectangular prism has a rectangular cross-section.
It depends on the pyramid. If it is a square based pyramid, a horizontal plane will give a square cross section, a plane inclined by a rotation parallel to one of the base axes will give a rectangular cross section whereas a plane inclined by rotation along both basal axes will result in a parallelogram cross section. Not sure how you get a parallelogram from a pentagonal or hexagonal (etc) pyramid.
Answer 1A triangle. Answer 2For a triangular prism, the cross section is a triangle.
triangular prism
Yes the triangular cross-section area is congruent throughput the prism.