The circumference of a circle is 2*pi*r. With r = 3, the circumference is 6 pi.
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the radius is 10.5 inches. * * * * * Wrong! Circumference = 2*pi*Radius Or, Radius = Circumference/(2*pi) So circumference = 21 inches implies radius = 3.34 inches (to 3 sf)
6 inches because the diameter is twice the radius 3+3 = 6 circumference = pi*6 = 18.849 inches
radius = 17.5/(2*pi) = 2.785 inches to 3 decimal places
C = 18.8 inches
The circumference of a cirlce that has a diameter of 3 inches would be about 9.42 inches