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Home > CC2 > Chapter 9 > Lesson 9.1.1 > Problem 9-16

9-16.
  1. Find the circumference of each of the circles described below. Homework Help ✎

    1. Radius of 3 inches

    2. Diameter of 27 cm

Recall that the circumference of a circle = 2π(radius).

2π(3 inches) = 6π ≈ 18.84 inches

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

27π
To get an appropriate decimal answer, round π so that it equals 3.14