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Question

In triangle A B C comma blankif tan invisible function application open parentheses A divided by 2 close parentheses equals 5 divided by 6 and tan invisible function application open parentheses B divided by 2 close parentheses equals 20 divided by 37 comma blankthe sides a comma blank b blankandblank c are in

  1. A.P.  
  2. GP.  
  3. H.P  
  4. None of these  

The correct answer is: A.P.


    We have
    tan invisible function application fraction numerator C over denominator 2 end fraction equals tan invisible function application open parentheses 90 degree minus fraction numerator A plus B over denominator 2 end fraction close parentheses
    equals cot invisible function application fraction numerator A plus B over denominator 2 end fraction equals fraction numerator cot invisible function application open parentheses A divided by 2 close parentheses cot invisible function application open parentheses B divided by 2 close parentheses minus 1 over denominator cot invisible function application open parentheses A divided by 2 close parentheses plus cot invisible function application open parentheses B divided by 2 close parentheses end fraction
    equals fraction numerator fraction numerator 6 over denominator 5 end fraction cross times fraction numerator 37 over denominator 20 end fraction minus 1 over denominator fraction numerator 6 over denominator 5 end fraction plus fraction numerator 37 over denominator 20 end fraction end fraction
    equals fraction numerator 222 minus 100 over denominator 120 plus 185 end fraction equals fraction numerator 122 over denominator 305 end fraction equals fraction numerator 2 over denominator 5 end fraction
    Also, tan invisible function application fraction numerator A over denominator 2 end fraction tan invisible function application fraction numerator C over denominator 2 end fraction equals square root of fraction numerator open parentheses s minus b close parentheses open parentheses s minus c close parentheses over denominator s open parentheses s minus a close parentheses end fraction end root blank square root of fraction numerator open parentheses s minus a close parentheses blank open parentheses s minus b close parentheses over denominator s open parentheses s minus c close parentheses end fraction end root
    rightwards double arrow fraction numerator 5 over denominator 6 end fraction cross times fraction numerator 2 over denominator 5 end fraction equals fraction numerator s minus b over denominator s end fraction
    rightwards double arrow 3 open parentheses s minus b close parentheses equals s
    rightwards double arrow 2 s equals 3 b blank rightwards double arrow a plus b plus c equals 3 b
    rightwards double arrow a plus c equals 2 b
    rightwards double arrow a comma blank b blankandblank c blankare in A.P.

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