It is the base/face of a certain shape, as in a square, it would be the bottom line(the one on/closest to the ground).
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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.