The generic term is a hexahedron.
A hexahedron is a solid with six plane faces, and a cuboid is a six-sided figure each face of which is a rectangle.
A face is a flat surface. The only solid with no flat surfaces is a sphere.
A face.
A face.
You take a look at what 2-D shape the face is, and then that's the name of the face.
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The surface of a solid. A square has four sides. A cube has six faces.
A cube has six square faces.
The least number of planes that can enclose a solid is four, which form a tetrahedron. A tetrahedron is a three-dimensional shape with four triangular faces, four vertices, and six edges. Each face of the tetrahedron is a triangle, and together they completely enclose a volume in space.
A contradiction. A solid is a 3-dimensional object, a face is 2-dimensional. Hence you cannot have a solid face.
Its cross-section area
A solid with a regular polygon for each face is known as a perfect solid.