How many face does a circle have?

Answer 1

Faces are planar sides of a polyhedron. As a 2-dimenional shape, a circle has no "faces."

A sphere migt be considered to have "one face" except that the definition of a face requires a flat surface, which a sphere does not have.
[a circle is 2-dimensional therefore has sides instead of faces])

Answer 2

I'm not sure whether the answer is:

• None because it is a 2-D shape

OR

• One