12 inches
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20 inches will be the 'diameter' so the 'radius' will be 10 inches.
If the circumference is 24 the radius will be: 3.82
radius = 65/(2*pi) = 10.3450713 inches
Radius of the circle: 3.65/2 = 1.825 inches
A circle with a radius of 3.4 inches has a circumference of 21.36 inches.