Circumference equals Diameter X Pi. In this case, 19 in X 3.14159 equals 59.69 in.
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The circumference of a circle that has a diameter of 19 is about 59.69
If a circle has a diameter of 19, the circumference is: 59.7 (diameter x Pi = circumference)
59.690260418206066
If the circumference is 38, the diameter is 38/pi. Since the radius is half of the diameter, the radius is 19/pi.
Circumference = Pi * Diameter Diameter = Circumference ÷ Pi D = 19 ÷ 3.1415... D = 6.048 inches