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

  • question_answer
    From the given figure, find the value of \[{{y}^{o}}\] when\[{{x}^{o}}={{30}^{o}}\].

    A) \[{{25}^{o}}\]                        

    B)        \[{{24}^{o}}\]            

    C)        \[{{36}^{o}}\]                        

    D)        \[{{45}^{o}}\]

    Correct Answer: B

    Solution :

    \[2{{x}^{o}}+5{{y}^{o}}={{180}^{o}}\] \[\Rightarrow \]\[2({{30}^{o}})+5{{y}^{o}}={{180}^{o}}\Rightarrow y={{24}^{o}}\]


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