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9th Class Mathematics Geometry Question Bank Geometry

  • question_answer
    If each interior angle of a regular polygon is 3 times its exterior angle, the number of sides of the polygon is :

    A) 4                         

    B)        5

    C) 6                         

    D)        8

    E) None of these

    Correct Answer: D

    Solution :

    Explanation Option [d] is correct. Interior angle = 3 x exterior angle \[180{}^\circ -\frac{360{}^\circ }{n}=3\times \left( \frac{360}{n} \right)\Rightarrow n=8\]


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