Maths-
General
Easy

Question

In a increment blank P Q R as shown in figure given that x colon y colon z equals 2 colon 3 colon 6, then the value of angle Q P R is

  1. fraction numerator pi over denominator 6 end fraction    
  2. fraction numerator pi over denominator 4 end fraction    
  3. fraction numerator pi over denominator 3 end fraction    
  4. None of these    

The correct answer is: fraction numerator pi over denominator 4 end fraction


    null
    equals fraction numerator fraction numerator y over denominator z end fraction plus fraction numerator x over denominator z end fraction over denominator 1 minus fraction numerator y over denominator z end fraction cross times fraction numerator x over denominator z end fraction end fraction
    equals fraction numerator fraction numerator 3 over denominator 6 end fraction plus fraction numerator 2 over denominator 6 end fraction over denominator 1 minus fraction numerator 3 over denominator 6 end fraction cross times fraction numerator 2 over denominator 6 end fraction end fraction equals 1

    rightwards double arrow blank alpha plus beta equals angle Q P R equals fraction numerator pi over denominator 4 end fraction

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