KVPY Sample Paper KVPY Stream-SX Model Paper-8

  • question_answer
    If \[{{c}^{2}}={{a}^{2}}+{{b}^{2}},\]\[2s=a+b+c,\] then \[{{V}_{\max }}\]

    A) \[{{s}^{4}}\]                          

    B) \[{{b}^{2}}{{c}^{2}}\]  

    C) \[{{c}^{2}}{{a}^{2}}\]                                 

    D) \[{{a}^{2}}{{b}^{2}}\]

    Correct Answer: D

    Solution :

    \[{{c}^{2}}={{a}^{2}}+{{b}^{2}}\]
    \[\Rightarrow \angle C=\frac{\pi }{2}\]
    \[\therefore \Delta =\frac{1}{2}ab\,\,\sin \,\,C=\frac{1}{2}ab\]
    \[\Rightarrow \sqrt{s\,\,(s-a)\,\,(s-b)\,\,(s-c)}=\frac{1}{2}ab\]
    \[\Rightarrow 4s\,\,(s-a)\,\,(s-b)\,\,(s-c)={{a}^{2}}{{b}^{2}}\]


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