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  2. Length - Wikipedia

    en.wikipedia.org/wiki/Length

    Length is commonly understood to mean the most extended dimension of a fixed object. [ 1] However, this is not always the case and may depend on the position the object is in. Various terms for the length of a fixed object are used, and these include height, which is vertical length or vertical extent, width, breadth, and depth.

  3. Human vaginal size - Wikipedia

    en.wikipedia.org/wiki/Human_vaginal_size

    Mean length from cervix to introitus: 6.3 cm (2.5 in). Mean width: at the proximal vagina: 3.3 cm (1.3 in); at the pelvic diaphragm: 2.7 cm (1.1 in); at the introitus: 2.6 cm (1.0 in) A 2006 U.S. study of vagina sizes using Magnetic Resonance Imaging (MRI) on 28 volunteers between 18 and 39 years old, with heights ranging from 1.5 to 1.7 metres ...

  4. Olympic-size swimming pool - Wikipedia

    en.wikipedia.org/wiki/Olympic-size_swimming_pool

    2,500,000 L (2,500 m 3; 88,000 cu ft), assuming a nominal depth of 2 m. About 2 acre-feet . There must be two spaces 2.5 m (8 ft 2 in) wide outside lanes 1 and 8 (in effect, two empty lanes). [ 3] The length of 50 metres (164 ft) must be between the touch pads at the end of each lane, if they are used. [ 3]

  5. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    Four-dimensional space ( 4D) is the mathematical extension of the concept of three-dimensional space (3D). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world.

  6. Three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Three-dimensional_space

    Three-dimensional space. A representation of a three-dimensional Cartesian coordinate system with the x -axis pointing towards the observer. In geometry, a three-dimensional space ( 3D space, 3-space or, rarely, tri-dimensional space) is a mathematical space in which three values ( coordinates) are required to determine the position of a point.

  7. Lake Michigan - Wikipedia

    en.wikipedia.org/wiki/Lake_Michigan

    1 Shore length is not a well-defined measure. Lake Michigan ( / ˈ m ɪ ʃ ɪ ɡ ən / ⓘ MISH -ig-ən ) is one of the five Great Lakes of North America . It is the second-largest of the Great Lakes by volume [ 5 ] (1,180 cu mi (4,900 km 3 )) and the third-largest by surface area (22,405 sq mi (58,030 km 2 )), after Lake Superior and Lake Huron .

  8. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    A ruler, depicting two customary units of length, the centimeter and the inch. A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. The most common units in modern use are the metric units, used in every country globally. In the United States the U.S. customary units are also in use.

  9. Human head - Wikipedia

    en.wikipedia.org/wiki/Human_head

    The human head consists of a fleshy outer portion, which surrounds the bony skull. The brain is enclosed within the skull. There are 22 bones in the human head. The head rests on the neck, and the seven cervical vertebrae support it. The human head typically weighs between 2.3 and 5 kilograms (5.1 and 11.0 lb) Over 98% of humans fit into this ...