Yes
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A cube is a solid figure called a polyhedron. A polyhedron is a solid figure with all flat faces. So a cone would be a solid figure but not a polyhedron becasue it has a curve and does not have all flat faces.
Polyhedron is a geometric solid in three dimensions with flat faces and straight edges.
flat surfaces on any polyhedron are called faces
No because a polygon is a plane figure. A football is a bit like a polyhedron, but all the faces of a polyhedron must be flat and, because of inflation, those of a football are not.
What polyhedron has eight sides and all of the are equilateral triangle?