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Describe the Elements of Polyhedral objects
Objects that are often encountered in engineering applications can be classified as either polyhedral or curved objects. A polyhedral object consists of planar faces connected at straight edges, which, in turn, are connected at vertices, e.g. a cube or a tetrahedron. A curved object has curved faces and edges, e.g. a cylinder and a sphere. Polyhedral objects can be classified into following four classes :
Simple Polyhedra
These do not have holes and each face is bounded by a single set of connected edges, i.e. bounded by one loop of edges (Figure ). Polyhedra with Faces of Inner Loops
These are similar to the first with the exception that a face may be bounded by more than one loop of edges (Figure(b)).
Polyhedral with Not Through Holes A hole may have a face coincident with the object boundary or an interior hole (Figure(c)).
Polyhedra with Through Holes
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