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Circumference equals Diameter X Pi. In this case, 19 in X 3.14159 equals 59.69 in.
If a circle has a diameter of 19, the circumference is: 59.7 (diameter x Pi = circumference)
The circumference of a circle that has a diameter of 19 is about 59.69
The circumference of a circle with a 39 inch diameter is 122.52 inches.
The circumference of 9 inch diameter circle is about 28.27 inches.