Mathematics
If a solid shape is completely bounded by plane faces, then the least number of faces it may have is
3
4
5
6
3D Shapes
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Answer
A solid bounded by plane faces is called a polyhedron. The minimum number of faces needed to enclose a 3-D region with plane faces is 4 (as in a tetrahedron or triangular pyramid).
A triangular pyramid (tetrahedron) has exactly 4 triangular faces.
Hence, option 2 is the correct option.
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