1.   Which figure is not a polygon?
    A. B.
    C. D.
    Hint

  2.   The polygon shown is_______.
   
    A. a quadrilateral B. regular
    C. concave D. a hexagon
    Hint

  3.   The polygon shown is
   
    A. an octagon B. a hexagon
    C. concave D. regular
    Hint

  4.   What is the measure of an interior angle of a regular 9-gon?
    A. 135 B. 147
    C. 140 D. 144
    Hint

  5.   The exterior angle of a regular polygon is 32.7°. Find the number of sides.
    A. 10 B. 6
    C. 11 D. 7
    Hint