The bottom or (Base) of a shape. Example...
Any face that is not a base is a what
Yes. A base on a polyhedron is a face and a base on a polygon is a side.
It depends on the shape of the base. A pyramid or a prism can have any polygonal shape as base and the formula for its area will depend on the shape. With other solid figures, the base may simply be the face tat the object happens to be "sitting" on: roll it and another face becomes the base.
The handsome part is the shape of the face
sphere
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).
Cone
sphere
A cylinder perhaps
True.
A cone. It has a circle for the base, and a curved face tapering to a point.