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

  • question_answer
    The measure of an angle is four times the measure of its supplement. Identify the angles.

    A) \[{{36}^{o}},\,\,{{144}^{o}}\]                      

    B) \[{{40}^{o}},\,\,{{160}^{o}}\]          

    C)        \[{{18}^{o}},\,\,{{72}^{o}}\]

    D)        \[{{50}^{o}},\,\,{{200}^{o}}\]

    Correct Answer: A

    Solution :

    Given that,\[{{x}^{o}}+4{{x}^{o}}={{180}^{o}}\] \[\Rightarrow \]\[x={{36}^{o}}\]and \[4x=4\times {{36}^{o}}={{144}^{o}}\]


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