A box has six. A cylinder has three, its curved side being one face.

It is a quick check that a feature did what was meant: a bore adds one face, and a fillet one for each edge it rounds.

 ## Six flat faces and the bore
 S = subtract (solid.box (40, 30, 10), ...
               translate (solid.cylinder (5, 10), [20, 15, 0]));
 numfaces (S)
 ⇒ 7

See also: solid.Shape.numsolids, solid.Shape.numedges

Source Code: solid.Shape