We have four congruent equilateral triangle what do we need more to make a pyramid
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According to the definition of a polyhedron, option (c) figure does not satisfies the condition of a polyhedron.
Since, a solid is a polyhedron if it is made up of only polygonal-faces, the faces meet at edges with one line segment and the edges meeting at a point. The point is generally called as vertex. But all the faces of option (c) are not polygons
Since, a solid is a polyhedron if it is made up of only polygonal-faces, the faces meet at edges with one line segment and the edges meeting at a point. The point is generally called as vertex. But all the faces of option (c) are not polygons
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