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Railways PYQCBT 1 2016

RRB NTPC · Question 43

What is the ratio of radius of incircle and circumcircle for an equilateral triangle with an area of 22√3 square units? A. ½ B. ¼ C. 1/3 D. 2/3

  1. C

  2. B

  3. A

  4. D

Show answer & explanation

Answer: (C) A

Explanation

In any equilateral triangle the inradius is a/(2√3) and the circumradius a/√3, so their ratio is always 1 : 2, whatever the area.