Railways R.R.C. (Hajipur) Solved Paper Held on 1st Shift 30-11-2014

  • question_answer
    If the diagonal of a rectangle is 17 cm long and it's perimeter is 46 cm, the area of the rectangle is?

    A) \[100\,\,c{{m}^{2}}\]              

    B) \[110\,\,c{{m}^{2}}\]

    C) \[120\,\,c{{m}^{2}}\]              

    D) \[150\,\,c{{m}^{2}}\]

    Correct Answer: C

    Solution :

    Let length and breadth of the rectangle are l and b cm respectively. Then,    \[{{l}^{2}}+{{b}^{2}}={{17}^{2}}=289\]  .,.(1) And      \[2\,\,(l+b)=46\] \[l+b=23\]                     ...(2) Area of the rectangle =\[l\times b\] \[=\frac{{{(l+b)}^{2}}-({{l}^{2}}+{{b}^{2}})}{2}\] \[=\frac{{{23}^{2}}-289}{2}\] \[=\frac{529-289}{2}\] \[=\frac{240}{2}=120\,\,c{{m}^{2}}\]


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