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  2. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    Similarly / = is a constructible angle because 12 is a power of two (4) times a Fermat prime (3). But π / 9 = 20 ∘ {\displaystyle \pi /9=20^{\circ }} is not a constructible angle, since 9 = 3 ⋅ 3 {\displaystyle 9=3\cdot 3} is not the product of distinct Fermat primes as it contains 3 as a factor twice, and neither is π / 7 ≈ 25.714 ∘ ...

  3. Gradian - Wikipedia

    en.wikipedia.org/wiki/Gradian

    [2] [3] [4] It is equivalent to ⁠ 1 / 400 ⁠ of a turn, [5] ⁠ 9 / 10 ⁠ of a degree, or ⁠ π / 200 ⁠ of a radian. Measuring angles in gradians (gons) is said to employ the centesimal system of angular measurement, initiated as part of metrication and decimalisation efforts.

  4. Orders of magnitude (power) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(power)

    10 9: giga-(GW) 1.3 × 10 9. tech: electric power output of Manitoba Hydro Limestone hydroelectric generating station 2.074 × 10 9: tech: peak power generation of Hoover Dam: 2.1 × 10 9: tech: peak power generation of Aswan Dam: 3.4 × 10 9: tech: estimated power consumption of the Bitcoin network in 2017 [29] 4.116 × 10 9

  5. Optical power - Wikipedia

    en.wikipedia.org/wiki/Optical_power

    In optics, optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the focal length of the device: P = 1/f. [1] High optical power corresponds to short focal length.

  6. Twelfth root of two - Wikipedia

    en.wikipedia.org/wiki/Twelfth_root_of_two

    The twelfth root of two or (or equivalently /) is an algebraic irrational number, approximately equal to 1.0594631.It is most important in Western music theory, where it represents the frequency ratio (musical interval) of a semitone (Play ⓘ) in twelve-tone equal temperament.

  7. Linear function (calculus) - Wikipedia

    en.wikipedia.org/wiki/Linear_function_(calculus)

    If both arguments and values of a function are in the logarithmic scale (i.e., when log(y) is a linear function of log(x)), then the straight line represents a power law: ⁡ = ⁡ + = Archimedean spiral defined by the polar equation r = 1 ⁄ 2 θ + 2

  8. List of Marvel Cinematic Universe films - Wikipedia

    en.wikipedia.org/wiki/List_of_Marvel_Cinematic...

    The box set includes all six of the Phase Two films—Iron Man 3, Thor: The Dark World, Captain America: The Winter Soldier, Guardians of the Galaxy, Avengers: Age of Ultron, and Ant-Man—on Blu-ray, Blu-ray 3D and a digital copy, in a replica of the Orb from Guardians of the Galaxy, plus a bonus disc and exclusive memorabilia.

  9. Hydroelectricity in China - Wikipedia

    en.wikipedia.org/wiki/Hydroelectricity_in_China

    China's installed hydroelectric capacity in 2021 was 390.9 GW, including 36.4 GW of pumped storage hydroelectricity capacity, up from 233 GW in 2011. [ 3 ] [ 4 ] That year, hydropower generated 1,300 TWh of power, [ 5 ] an increase of 68 TWh over 2018 when hydropower generated 1,232 TWh of power, accounting for roughly 18% of China's total ...