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

  • question_answer
    A If two angles in a triangle are \[{{65}^{o}}\] and \[{{85}^{o}},\] what is the third angle?

    A)  \[{{30}^{o}}\]    

    B)         \[{{45}^{o}}\]  

    C)  \[{{60}^{o}}\]   

    D)         \[{{90}^{o}}\]

    Correct Answer: A

    Solution :

     Since sum of the angles in a triangle \[={{180}^{o}}\] \[{{65}^{o}}+{{85}^{o}}+x={{180}^{o}}\,\,\,\Rightarrow \,\,\,x={{30}^{o}}\] \[\therefore \] Third angle \[={{30}^{o}}\]


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