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A hat size of 7.375 inches corresponds to a size 7 3/8 in the U.S. hat sizing system. This size indicates a head circumference of approximately 23.125 inches. Hat sizing can vary slightly between brands, so it's always a good idea to try on hats when possible for the best fit.
Pi
21 centimeters is 8.3 inches
It is: 21*96 = 2016 square inches
A circle with a radius of 21 inches has a circumference of 131.95 inches.