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Railways PYQCBT 1 2016

RRB NTPC · Question 13

If A + B = 90° and A : B = 2 : 1, Then tan A : tan B = ?

  1. 4 : 5

  2. 2 : 3

  3. 3 : 1

  4. 1 : 3

Show answer & explanation

Answer: (C) 3 : 1

Explanation

A + B = 90° and A : B = 2 : 1 give A = 60° and B = 30°. tan 60° : tan 30° = √3 : 1/√3 = 3 : 1.