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Railways PYQCBT 1 2016

RRB NTPC · Question 80

If the area of a circle is 9π sq. cm then its circumference is

  1. 9 cm

  2. 6π cm

  3. 3π cm

  4. 6 cm

Show answer & explanation

Answer: (B) 6π cm

Explanation

Area = πr² = 9π, so r² = 9 and r = 3 cm. Circumference = 2πr = 2π × 3 = 6π cm.