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Can be. It would be the net of the polyhedron.
They are the faces of the polyhedron.
They are its faces.
Yes when in the form of a tetrahedron which is a triangular based pyramid
True.
Can be. It would be the net of the polyhedron.
net
They are the faces of the polyhedron.
A net is an arrangement of polygons, joined edge-to-edge, that when folded up, form the surface of a polyhedron.
They are its faces.
The most common of these are anticlines and synclines; anticlines are the "crests", while synclines are the "troughs".
Any polygon can be the base of a pyramid and so any polygon can form a polyhedron.
that's a statement, but if you ment to say are the... then yes
It takes 20 years for a folded mountain to form
No. A polyhedron is 3 dimensional. You have a regular polygon, regular because the sides are equal. If you asked about 20 surfaces, then it would be a polyhedron.
Two faces of a polyhedron form a wedge-shaped segment in three dimensional space.
In some cases, the folded crust can be pushed up high enough to form mountains.