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6 inches because the diameter is twice the radius 3+3 = 6 circumference = pi*6 = 18.849 inches
The radius is 1.5. The formula to get the radius is Diameter/2.
The radius is half diameter, so in your case the radius would be 1.5 inches.
The radius would be 4, because the radius is always half of the diameter.
The circumference of a cirlce that has a diameter of 3 inches would be about 9.42 inches