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

  • question_answer
    If the angles of a triangle are in the ratio 2:3:4, then the triangle formed will be

    A)  right angled triangle

    B)  isosceles triangle

    C)  scalene triangle

    D)  obtuse angled triangle

    Correct Answer: C

    Solution :

    Let angles o the triangle be \[2x,3x,4x\] \[\therefore \]\[2x+3x+4x={{180}^{o}}\] \[\Rightarrow \]\[9x={{180}^{o}}\Rightarrow x={{20}^{o}}\] \[\therefore \]Required angles are \[{{40}^{o}}{{.60}^{o}},{{80}^{o}}\] So, the triangles formed will be scalene triangle.


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