one face is a circle
if you unwrap a cone, it looks like a pacman, so basically a circle with a sector taken out
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sphere, cylinder and a cone
If they are all plane faces then there is no such figure. Otherwise it could be a sphere intersected by two planes, an ellipsoid intersected by two planes, a cone intersected by two planes, or one of several other shapes.
A cone has two faces.
A cone has faces but no corners.
A cone has 2 faces.