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Railways PYQCBT 1 2016

RRB NTPC · Question 83

If the radius (r) of a circle is increased by ‘x’ units, what is the number of units by which the circumference of the circle is increased? A. π B. 2π C. 2πr D. 2πx

  1. D

  2. C

  3. B

  4. A

Show answer & explanation

Answer: (A) D

Explanation

Circumference = 2πr. With radius r + x, it becomes 2π(r + x) = 2πr + 2πx, so the increase is 2πx units.