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CTET 8 Feb 2026 Paper 1, Question 42

Topic: Shapes and space

Q42

A triangular pyramid has :

  1. (1) 4 faces and 6 edges.Correct answer
  2. (2) 3 faces and 6 edges.
  3. (3) 3 faces and 4 edges.
  4. (4) 4 faces and 4 edges.

Solution.

CBSE answer: (1)

Answer: (1) 4 faces and 6 edges

  1. A triangular pyramid has a triangle base and three triangle side faces: 1+3=41 + 3 = 4 faces.
  2. Edges: 3 on the base and 3 rising to the top: 3+3=63 + 3 = 6.
  3. Check with Euler: F+V−E=4+4−6=2F + V - E = 4 + 4 - 6 = 2.

Trap: (2) forgets the base face.