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  2. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  3. Megalithic yard - Wikipedia

    en.wikipedia.org/wiki/Megalithic_yard

    An oak rod from the Iron Age fortified settlement at Borre Fen measured 53.15 inches (135.0 cm) with marks dividing it up into eight parts of 6.64 inches (16.9 cm). Euan Mackie referred to five-eighths of this rod 33.2 inches (84 cm) as "very close to a megalithic yard". [10]

  4. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The consensus of modern scholars is that this pyramid's proportions are not based on the golden ratio, because such a basis would be inconsistent both with what is known about Egyptian mathematics from the time of construction of the pyramid, and with Egyptian theories of architecture and proportion used in their other works. [108]

  5. Golden rectangle - Wikipedia

    en.wikipedia.org/wiki/Golden_rectangle

    Euclid gives an alternative construction of the golden rectangle using three polygons circumscribed by congruent circles: a regular decagon, hexagon, and pentagon. The respective lengths a , b , and c of the sides of these three polygons satisfy the equation a 2 + b 2 = c 2 , so line segments with these lengths form a right triangle (by the ...

  6. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    Rack units are typically denoted without a space between the number of units and the 'U'. Thus, a 4U server enclosure (case) is seven inches (177.8 mm) high, or more practically, built to occupy a vertical space seven inches high, with sufficient clearance to allow movement of adjacent hardware.

  7. Compass (drawing tool) - Wikipedia

    en.wikipedia.org/wiki/Compass_(drawing_tool)

    A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.

  8. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    Straw bales perform at about R-2.38 to 2.68 per inch, depending on orientation of the bales. [42] However, typical straw bale houses have very thick walls and thus are well insulated. Snow is roughly R-1 per inch. Brick has a very poor insulating ability at a mere R-0.2 per inch; however it does have a relatively good thermal mass.

  9. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    For unit conversion, the implied uncertainty of the result can be unsatisfactorily higher than that in the previous unit if this rounding guideline is followed; For example, 8 inch has the implied uncertainty of ± 0.5 inch = ± 1.27 cm.