Circumference = Pi * Diameter
Diameter = Circumference ÷ Pi
D = 19 ÷ 3.1415...
D = 6.048 inches
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If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).
The circumference of a circle if its diameter is 20 inches is: 62.83 inches (diameter x Pi = circumference).
If a circle has a diameter of 12.8 inches its circumference is: 40.21 inches (circumference = diameter x Pi).
If the circumference of a circle is 75 inches, the diameter is: about 23.87 inches. (diameter = circumference divided by pi).
If a circle has a diameter of 19, the circumference is: 59.7 (diameter x Pi = circumference)