Question
If we have a polyhedron, which of the following is true about its faces? Explain. [3 MARKS]
(i) It has 3 triangular faces.
(ii) It has 4 triangular faces.
(iii) It has 1 square and 4 triangular faces.
Answer: Option A
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Solution: 1 Mark each
A polyhedron is a solid with flat polygonal faces, straight edges and vertices.
(i) This is not true. The minimum number of faces a polyhedron can have is 4. Hence 3 triangles cannot be the faces of a polyhedron.
(ii) This is true. A polyhedron with 4 triangles as faces is known as a regular tetrahedron.
(iii) This is true. A polyhedron with 1 square and 4 triangular faces is known as a square pyramid.
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