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  2. 100-yard dash - Wikipedia

    en.wikipedia.org/wiki/100-yard_dash

    The 100-yard dash is a track and field sprint event of 100 yards (91.44 metres). It was part of the Commonwealth Games until 1970, and was included in the triathlon of the Olympics in 1904. It is not generally used in international events, replaced by the 100-metre sprint (109.36 yards). However, it is still occasionally run in the United ...

  3. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    For instance the same angle of 0.1 mrad will subtend 10 mm at 100 meters, 20 mm at 200 meters, etc., or similarly 0.39 inches at 100 m, 0.78 inches at 200 m, etc. Subtensions in mrad based optics are particularly useful together with target sizes and shooting distances in metric units .

  4. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    The physical group size equivalent to m minutes of arc can be calculated as follows: group size = tan(⁠ m / 60 ⁠) × distance. In the example previously given, for 1 minute of arc, and substituting 3,600 inches for 100 yards, 3,600 tan(⁠ 1 / 60 ⁠) ≈ 1.047 inches. In metric units 1 MOA at 100 metres ≈ 2.908 centimetres.

  5. Nautical mile - Wikipedia

    en.wikipedia.org/wiki/Nautical_mile

    A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute (⁠ 1 / 60 ⁠ of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).

  6. Metrication in the United States - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    Metrication in the United States. A shampoo label from the U.S. that shows a round metric quantity taking secondary status in parentheses next to non-integer U.S. customary quantity. Metrication (or metrification) is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a ...

  7. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    The American football field, which has a playing area 100 yards (91.4 m) long by 160 feet (48.8 m) wide. This is often used by the American public media for the sizes of large buildings or parks. It is used both as a unit of length (100 yd or 91.4 m, the length of the playing field excluding goal areas) and as a unit of area (57,600 sq ft or ...

  8. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [5] Common imperial units and U.S. customary units of length include: [6] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)

  9. Link (unit) - Wikipedia

    en.wikipedia.org/wiki/Link_(unit)

    The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 100 of a US survey foot, [1] or exactly 7.92 inches or 20.1168 cm. The unit is based on Gunter's chain, a metal chain 66 ...