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US hat size is a measurement of head diameter in inches. It can be computed from a measurement of circumference in centimeters by dividing by 8, because multiplying 2.54 (the number of centimeters per inch) by π (the multiplier to give circumference from diameter) is almost exactly 8.
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A hat is a head covering that ... the average human head circumference to be 57 centimetres (22 + 1 ... showed an average size of 57.2 cm for males and 55.2 cm ...
US hat size is the circumference of the head, measured in inches, divided by pi, rounded to the nearest 1/8 inch. This corresponds to the 1D mean diameter. [1] Diameter at breast height is the circumference of tree trunk, measured at height of 4.5 feet, divided by pi. This corresponds to the 1D mean diameter.
For example: bike helmet label stating "head girth: 56–60 cm".) Product dimensions: The label states characteristic dimensions of the product. (For example: jeans label stating inner leg length of the jeans in centimetres or inches (not inner leg measurement of the intended wearer).)
A human skull and measurement device from 1902. Craniometry is measurement of the cranium (the main part of the skull), usually the human cranium.It is a subset of cephalometry, measurement of the head, which in humans is a subset of anthropometry, measurement of the human body.