Q:

Ankit is a Class V student and can classify different types of triangles. However, he has difficulty in understanding abstract proof behind the sum of all three angles of a triangle is always 180. Ankit is at which stage as per the Piaget Cognitive Theory:

• 1
  Pre-operational stage
• 2
  Formal operational stage
• 3
  Concrete operational stage
• 4
  Sensory operational stage