Area of a circle = pi times radius squared
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A 235 85 16 tire is 31.72 inches in diameter and has a 15.86 inch radius and a 99.65 inch circumference
C=pi * d C=pi * 85 pi is approximately 3.141592 85 * 3.14592=267.4032
85 inches = 7 ft 1 inch
129.73 inches (rounded)
85