None, really. Except that when a solid has faces of two kinds and there are only one or two faces of a particular shape then the solid is conventionally viewed with that face at the bottom (and top) and the bottom face is called the base.
Common examples are pyramids or prisms which may have bases that are triangular, quadrilateral, pentagon etc. Or cones and cylynders whose bases may be circles or ellipses.
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the DIFFERENCE between the place value and the face value is 991
The place value of the 3 in 329 is 300. The face value is 3. Therefore, the difference between the two is 300 - 3 = 297.
A cone has a circle for a base and a triangular prism has a triangle for a base
Its place value is 20 but its face value is 2
The place value is hundreds and the face value is 6.