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  2. Ruler - Wikipedia

    en.wikipedia.org/wiki/Ruler

    A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

  3. Three Rules of Discipline and Eight Points for Attention

    en.wikipedia.org/wiki/Three_Rules_of_Discipline...

    [3] It was common after a confiscation of items from warlords that the items would be redistributed among the people, in addition to supplying the Chinese Red Army. As a result, the peasants tended to spread disinformation to the Kuomintang when they arrived to pursue the Chinese Red Army, while showing the Chinese Red Army hospitality whenever ...

  4. Metre-stick - Wikipedia

    en.wikipedia.org/wiki/Metre-stick

    In the United States, the marking is usually in customary units (three feet 3 + 38 inches with inch and fractional inch). Hybrid measures bearing customary markings on one side and metric units on the other also exist and are sometimes referred to as yardsticks, metre-whesticks [citation needed] or "metre rulers". The spelling meter vs ...

  5. Graduation (scale) - Wikipedia

    en.wikipedia.org/wiki/Graduation_(scale)

    A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.

  6. Scale ruler - Wikipedia

    en.wikipedia.org/wiki/Scale_ruler

    A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale. In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is called a scale.

  7. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Inverting this process allows square roots to be found, and similarly for the powers 3, 1/3, 2/3, and 3/2. Care must be taken when the base, x, is found in more than one place on its scale. For instance, there are two nines on the A scale; to find the square root of nine, use the first one; the second one gives the square root of 90.

  8. Sparse ruler - Wikipedia

    en.wikipedia.org/wiki/Sparse_ruler

    There are 3 different configurations of sparse rulers of length 13 with 6 marks. One is {0, 1, 2, 6, 10, 13}. To measure a length of 7, say, with this ruler one would ...

  9. Angle trisection - Wikipedia

    en.wikipedia.org/wiki/Angle_trisection

    Then by the triple-angle formula, cos ⁠ π / 3 ⁠ = 4x 3 − 3x and so 4x 3 − 3x = ⁠ 1 / 2 ⁠. Thus 8x 3 − 6x − 1 = 0. Define p(t) to be the polynomial p(t) = 8t 3 − 6t − 1. Since x = cos 20° is a root of p(t), the minimal polynomial for cos 20° is a factor of p(t). Because p(t) has degree 3, if it is reducible over by Q then ...

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