A base is just the "bottom" of a shape. Shapes are in three dimensional shape, so if they are rotated around, it can sometimes be hard to say exactly what the base is.
For example, the base of a triangle can be ANY one of the three sides.
It's best to pick a base which is perpendicular (i.e., forms a 90 degree angle) with the height. Otherwise, you'll have to use more trigonometry to solve simple equations like, Area = (1/2) b x h
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Their base shape. For example a rectangular prism has base that is a rectangle. Guess what kind of base shape a triangular prism has? yes, triangle.
Its a Pentagon.
If it is a pyramid, then the base shape is a SQURE. If it is a tetrahedron, then the base shape is a triangle.
The answer depends on the shape of the base: the appropriate formula will vary from one shape to another.
It is normally rectangular in shape.