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7th Class Mathematics Lines and Angles Question Bank Lines and Angles

  • question_answer
    If the angles \[{{(2a-10)}^{o}}\] and \[{{(a-11)}^{o}}\] are  complementary, what is the value of 'a'?

    A)  \[{{37}^{o}}\]    

    B)                         \[{{27}^{o}}\]

    C)  \[{{17}^{o}}\]  

    D)         \[{{7}^{o}}\]

    Correct Answer: A

    Solution :

       Given, the angles  \[{{(2a-10)}^{o}}\] and \[{{(a-11)}^{o}}\] are complementary angles. \[\therefore \] \[{{(2a-10)}^{o}}+{{(a-11)}^{o}}={{90}^{o}}\] \[\therefore \] \[a={{37}^{o}}\]


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