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  2. Hat - Wikipedia

    en.wikipedia.org/wiki/Hat

    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.

  3. Human head - Wikipedia

    en.wikipedia.org/wiki/Human_head

    Hats may be worn as part of a uniform or used as a protective ... most do not measure average head circumference past the age of 21. ... 7.3 8.3 8.7 Women 5.7 6.0 6.5 ...

  4. Body roundness index - Wikipedia

    en.wikipedia.org/wiki/Body_roundness_index

    Waist circumference and height can be in any unit of length, as long as they both use the same one. [ 1 ] [ 3 ] Predictions of % total body fat and % visceral adipose tissue apply a different eccentricity equation using waist and hip circumferences, age, height, gender, ethnicity, and body weight as inputs.

  5. How to Measure Your Head for a Hat - AOL

    www.aol.com/lifestyle/measure-head-hat-232914418...

    For premium support please call: 800-290-4726 more ways to reach us

  6. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    Perimeter is the distance around a two dimensional shape, a measurement of the distance around something; the length of the boundary. A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference.

  7. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    t. e. The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.

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