7th Class Mathematics The Triangle and its Properties Question Bank Triangles

  • question_answer
    Find the angles x and y respectively.

    A)                  \[x={{47}^{o}},y={{25}^{o}}\]

    B)                  \[x={{27}^{o}},y={{45}^{o}}\]

    C)                  \[x={{45}^{o}},y={{27}^{o}}\]  

    D)                  \[x={{25}^{o}},y={{47}^{o}}\]

    Correct Answer: C

    Solution :

      Given \[BE||CD,\] \[{{x}^{o}}={{45}^{o}}\]. (Corresponding angles) In \[\Delta ACD,\] \[{{x}^{o}}+{{y}^{o}}+{{108}^{o}}={{180}^{o}}\] (Angle sum property.) \[\Rightarrow \]               \[{{45}^{o}}+y+{{108}^{o}}={{180}^{o}}\] \[\Rightarrow \]               \[y={{180}^{o}}-{{153}^{o}}={{27}^{o}}\] \[\therefore \]  \[x={{45}^{o}},y={{27}^{o}}\]


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