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So that whatever leftover gunk happens to be on the table doesn't get all over the part of the stopper that goes into the bottle, contaminating the contents.
There are 2 completely flat sides on every cylinder.
square
A triangle has three sides !
Faces are sides but sides (as in sides of a square) need not be faces.
So that you don't contaminate the stopper with anything on the table. Also, if you lay it on it's side, there's a possibility that it rolls off the table and breaks.
So that whatever leftover gunk happens to be on the table doesn't get all over the part of the stopper that goes into the bottle, contaminating the contents.
A table shaped hill with a flat top and steep sides is called a plateau.
So they don't roll.
There are six flat sides
There are 2 completely flat sides on every cylinder.
square
A triangle has three sides !
Faces are sides but sides (as in sides of a square) need not be faces.
A pentagon has five flat sides
It is a pyramid.
A table