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  2. Turn (angle) - Wikipedia

    en.wikipedia.org/wiki/Turn_(angle)

    The superseded version ISO 80000-3:2006 defined "revolution" as a special name for the dimensionless unit "one", [c] which also received other special names, such as the radian. [ d ] Despite their dimensional homogeneity , these two specially named dimensionless units are applicable for non-comparable kinds of quantity : rotation and angle ...

  3. Coin rotation paradox - Wikipedia

    en.wikipedia.org/wiki/Coin_rotation_paradox

    The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

  4. Torus - Wikipedia

    en.wikipedia.org/wiki/Torus

    Poloidal direction (red arrow) and toroidal direction (blue arrow) A torus of revolution in 3-space can be parametrized as: [2] (,) = (+ ⁡) ⁡ (,) = (+ ⁡) ⁡ (,) = ⁡ using angular coordinates θ, φ ∈ [0, 2π), representing rotation around the tube and rotation around the torus's axis of revolution, respectively, where the major radius R is the distance from the center of the tube to ...

  5. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The mixed number ⁠2 + 3 / 4 ⁠ is spoken two and three quarters or two and three fourths, with the integer and fraction portions connected by the word and. [18] Subtraction or negation is applied to the entire mixed numeral, so − 2 3 4 {\displaystyle -2{\tfrac {3}{4}}} means − ( 2 + 3 4 ) . {\displaystyle -{\bigl (}2+{\tfrac {3}{4 ...

  6. Constant-mean-curvature surface - Wikipedia

    en.wikipedia.org/wiki/Constant-mean-curvature...

    In 1841 Delaunay proved that the only surfaces of revolution with constant mean curvature were the surfaces obtained by rotating the roulettes of the conics. These are the plane, cylinder, sphere, the catenoid, the unduloid and nodoid. [3]

  7. Revolutions in Mathematics - Wikipedia

    en.wikipedia.org/wiki/Revolutions_in_Mathematics

    Yu Xin Zheng, Non-Euclidean geometry and revolutions in mathematics (169–182); Luciano Boi, The "revolution" in the geometrical vision of space in the nineteenth century, and the hermeneutical epistemology of mathematics (183–208); Caroline Dunmore, Meta-level revolutions in mathematics (209–225);

  8. Threequarters - Wikipedia

    en.wikipedia.org/wiki/Threequarters

    The fraction (mathematics) 3 ⁄ 4 (three quarters) Topics referred to by the same term This disambiguation page lists articles associated with the title Threequarters .

  9. 3/4 - Wikipedia

    en.wikipedia.org/wiki/3/4

    Download as PDF; Printable version; In other projects ... 3/4 or 3 ⁄ 4 or ¾ may refer to: The fraction three quarters (3 ...