Discussion
A polyhedron is a solid bounded entirely by
Answer: A
Correct answer: plane surfaces
A polyhedron is bounded entirely by flat faces - prisms, pyramids, cubes and the five regular solids. The moment a curved surface appears the solid belongs to another class: a cylinder and a cone are solids of revolution, and a sphere is bounded by a single curved surface. The distinction matters in drawing because plane faces project as straight-edged figures.
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