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Find the circumference of each of the circles described below.  

  1. Radius of inches

    Recall that the circumference of a .

    A circle with a point in the middle, labeled center. A line segment, labeled diameter, goes across and through the point in the middle. A line segment, labeled radius, from the point in the middle, to the edge, of the circle.


  1. Diameter of cm

    Refer to the diagram from part (a) and recall that the .

    To get an appropriate decimal answer, round so that it equals .