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

  • question_answer
    If the angles of a triangle are in the ratio \[1:2:7,\]what type of a triangle is it?

    A)  An acute angled triangle.

    B)  An obtuse angled triangle.  

    C)  A right angled triangle.

    D)  A right angled isosceles triangle.

    Correct Answer: B

    Solution :

     Let the measures of the angles be \[1x,\,2x\] and \[7x\]. We have, \[1x+2x+7x={{180}^{o}}\]\[\Rightarrow \] \[x={{18}^{o}}\] The angles are \[{{18}^{o}},\,{{36}^{o}}\] and \[{{126}^{o}}\]. \[\therefore \] The triangle is obtuse angled.


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