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  5. The Triangle and its Properties

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

  • question_answer
    What is the value of \[\angle a\] in the given figure?

    A)  \[145{}^\circ \]                        

    B)  \[125{}^\circ \]        

    C)  \[100{}^\circ \]                    

    D)  \[140{}^\circ \]

    Correct Answer: B

    Solution :

    (b): 'a' = exterior \[\angle le=\angle ABC+\angle ACB=90{}^\circ +\angle ACB\] \[\angle ACB=180{}^\circ -145{}^\circ =35{}^\circ \] \[\therefore \,\,\,a=90+35{}^\circ \] \[=125{}^\circ \] 


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