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9th Class Mathematics Geometry Question Bank Geometry

  • question_answer
    The measurement of each angle of a polygon is \[160{}^\circ \]. The number of its sides is

    A)  15                         

    B)         18  

    C)  20                         

    D)         30

    Correct Answer: B

    Solution :

      Exterior angle \[={{180}^{o}}\]- Interior angle \[={{180}^{o}}-{{160}^{o}}={{20}^{o}}\] \[\therefore \]Number of sides \[=\frac{{{360}^{o}}}{Exterior\,\,angle}\]                 \[=\frac{360}{20}=18\]


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