The formulas for circumference are C=2*pi*r and C=pi*d so C= 3.14 times 2 gives you approximately 6.28 inches.
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Its diameter: 2*3.5 = 7 inches
Radius = 1/2 (diameter) = 25 inches.
Diameter X 3.14159265 divided by 4 X diameter X diameter. 2 * 3.14159265 / 4 * 2 * 2 = 6.2831853 square inches
Radius = Diameter/2. So in this case 4.5 inches.
Circumference = 2*pi*rr(radius) = diameter/2 = 36 in/2 = 18 inchesCircumference = 2*pi(18 inches)= 113 inches=========