20 inches will be the 'diameter' so the 'radius' will be 10 inches.
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12 inches
Radius of the circle: 3.65/2 = 1.825 inches
radius = 65/(2*pi) = 10.3450713 inches
That depends what you mean with "a 20 cm. circle". If 20 cm. is the radius, you already have the answer. If 20 cm. is the diameter, the radius is half the diameter. (10cm)
A circle with a radius of 3.4 inches has a circumference of 21.36 inches.