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

  • question_answer
    If one angle of a triangle is equal to the sum of the other two angles, the triangle must be:

    A) scalene            

    B) right angled

    C) obtuse angles              

    D) actute angled

    Correct Answer: B

    Solution :

        Let \[x,y\] and \[z\] is the angles, where \[x=y+z\] \[x+y+z=180{}^\circ \] (Angle sum property) \[(y+z)+y+z=180{}^\circ \] \[2(y+z)=180{}^\circ \] \[y+z=\frac{180{}^\circ }{2}=90{}^\circ \] \[x=90{}^\circ ,\] hence triangle is right angled.


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