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  2. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    Grade is usually expressed as a percentage - converted to the angle α by taking the inverse tangent of the standard mathematical slope, which is rise / run or the grade / 100. If one looks at red numbers on the chart specifying grade, one can see the quirkiness of using the grade to specify slope; the numbers go from 0 for flat, to 100% at 45 ...

  3. Standard error - Wikipedia

    en.wikipedia.org/wiki/Standard_error

    This page was last edited on 9 February 2025, at 06:02 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  4. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    Riser-Tread formula: Sometimes the stair parameters will be something like riser plus tread equals 17–18 inches (432–457 mm); [38] another formula is 2 times riser + tread equals 24.6 inches (625 mm), the length of a stride. [14] Thus a 7 inches (178 mm) rise and a 10.6 inches (269 mm) tread exactly meets this code.

  5. Abbe error - Wikipedia

    en.wikipedia.org/wiki/Abbe_error

    This page was last edited on 13 November 2024, at 11:52 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  6. Isometric projection - Wikipedia

    en.wikipedia.org/wiki/Isometric_projection

    We can calculate the length of the line from its center to the middle of any edge as √ 2 using Pythagoras' theorem. By rotating the cube by 45° on the x -axis, the point (1, 1, 1) will therefore become (1, 0, √ 2 ) as depicted in the diagram.

  7. Stair nosing - Wikipedia

    en.wikipedia.org/wiki/Stair_nosing

    The nosing is the protrusion beyond the riser when vertical risers are used, or beyond the back of the tread below, when angled risers or no risers are used. Anti-slip strips or nosings may be applied. These stair parts can be manufactured from a variety of materials including aluminum, vinyl, and wood.

  8. Dog-leg (stairs) - Wikipedia

    en.wikipedia.org/wiki/Dog-leg_(stairs)

    A dog-leg staircase A quarter-landing, on a dog-leg staircase, is made into an architectural feature, by the use of arches, vaulting and stained glass. A dog-leg is a configuration of stairs between two floors of a building, often a domestic building, in which a flight of stairs ascends to a quarter-landing before turning at a right angle and continuing upwards. [1]

  9. Symmetric mean absolute percentage error - Wikipedia

    en.wikipedia.org/wiki/Symmetric_mean_absolute...

    In contrast to the mean absolute percentage error, SMAPE has both a lower and an upper bound. Indeed, the formula above provides a result between 0% and 200%. Indeed, the formula above provides a result between 0% and 200%.

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