Does a triangular prism have 5 bases?

Answer 1

A traingular prism has 5 faces. Normally, with prisms the non-rectangular sides are called the bases. In that situation there are two triangular bases and three [lateral] rectangular faces. This kind of distinction falls apart when considering rectangular prisms (cuboids).

a cylinder has one base

if the base of a cylinder is composed of line segments it is called a prism

a prism has one base

if the base of a cylinder is a rectangle its called a rectangular prism

if the base of a cylinder is a square and the height is equal to the length of a side of the square it is called a cube