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Home > MC1 > Chapter 9 > Lesson 9.3.1 > Problem 9-124


Find the circumference of each of the circles described below.

  1. Radius of inches

    Recall the diagram from the Math Notes box from Lesson 9.3.1 below.
    Also recall that the same Math Notes box says that the circumference .


  2. Diameter of cm

    Refer to the diagram from part (a) and recall that the circumference = π(diameter).

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