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Railways PYQCBT 2 2017

RRB NTPC · Question 102

The surface area (in sq. cm.) of a sphere with radius 1 cm is : (take π = 22/7)

  1. 89/7

  2. 89/21

  3. 88/21

  4. 88/7

Show answer & explanation

Answer: (D) 88/7

Explanation

Surface area of a sphere = 4πr² = 4 × 22/7 × 1² = 88/7 sq cm.