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9th Class Mathematics Lines and Angles Question Bank Lines and Angles

  • question_answer
    From the figure given, if\[\angle POR\]and\[\angle QOR\]from a linear pair and\[a-b={{40}^{o}}\], what are the respective values of\[a\]and\[b\]?

    A) \[{{110}^{o}},\,\,{{70}^{o}}\]                      

    B)        \[{{70}^{o}},\,\,{{100}^{o}}\]          

    C)        \[{{80}^{o}},\,\,{{120}^{o}}\]                      

    D)        \[{{120}^{o}},\,\,{{80}^{o}}\]

    Correct Answer: A

    Solution :

    \[b+a={{180}^{o}}\]              (Linear pair) \[a-b={{40}^{o}}\Rightarrow a={{110}^{o}},b={{70}^{o}}\]


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