Generally there are eight corners - one at each junction of two walls and either the floor or the ceiling.
Though of course it does depend on the shape of the room, there may also be alcoves etc.
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A sphere has no faces an corners. The term "faces" and "corners" are applied to polyhedrons, figures with flat surfaces.
No corners, two faces
no edges and 4 corners
A pyramid with a four sided base has five faces and five corners.
2 edges (curved), 0 corners, and 3 faces (one of which is not flat) ------------------------------------------------------------------------------------------------- A cylinder has 0 vertices (corners), 0 edges, and 2 faces. If you need convincing, my proof is Euler's formula, which which relates all three and is true for all solids in Euclidean 3-space: V + F - E = 2 0 + 2 - 0 = 2 You cannot consider the curved boundaries when counting faces or edges.