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  2. Decagon - Wikipedia

    en.wikipedia.org/wiki/Decagon

    The regular decagon has Dih 10 symmetry, order 20. There are 3 subgroup dihedral symmetries: Dih 5, Dih 2, and Dih 1, and 4 cyclic group symmetries: Z 10, Z 5, Z 2, and Z 1. These 8 symmetries can be seen in 10 distinct symmetries on the decagon, a larger number because the lines of reflections can either pass through vertices or edges.

  3. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  4. Decagonal number - Wikipedia

    en.wikipedia.org/wiki/Decagonal_number

    Specifically, the n-th decagonal numbers counts the dots in a pattern of n nested decagons, all sharing a common corner, where the ith decagon in the pattern has sides made of i dots spaced one unit apart from each other. The n-th decagonal number is given by the following formula =.

  5. Pentadecagon - Wikipedia

    en.wikipedia.org/wiki/Pentadecagon

    Dih 15 has 3 dihedral subgroups: Dih 5, Dih 3, and Dih 1. And four more cyclic symmetries: Z 15, Z 5, Z 3, and Z 1, with Z n representing π/n radian rotational symmetry. On the pentadecagon, there are 8 distinct symmetries. John Conway labels these symmetries with a letter and order of the symmetry follows the letter. [3]

  6. Shoelace formula - Wikipedia

    en.wikipedia.org/wiki/Shoelace_formula

    Shoelace scheme for determining the area of a polygon with point coordinates (,),..., (,). The shoelace formula, also known as Gauss's area formula and the surveyor's formula, [1] is a mathematical algorithm to determine the area of a simple polygon whose vertices are described by their Cartesian coordinates in the plane. [2]

  7. Heptadecagon - Wikipedia

    en.wikipedia.org/wiki/Heptadecagon

    Publication by C. F. Gauss in Intelligenzblatt der allgemeinen Literatur-Zeitung. As 17 is a Fermat prime, the regular heptadecagon is a constructible polygon (that is, one that can be constructed using a compass and unmarked straightedge): this was shown by Carl Friedrich Gauss in 1796 at the age of 19. [1]

  8. The Fastest Way to Debloat After a Big Meal, According to ...

    www.aol.com/fastest-way-debloat-big-meal...

    We've got a great alternative to unbuttoning your pants and sitting on the sofa after a big meal: the No. 1 thing you should be doing to debloat fast is participating in some gentle movement, like ...

  9. Small stellated dodecahedron - Wikipedia

    en.wikipedia.org/wiki/Small_stellated_dodecahedron

    For example, a truncated pentagon {5 ⁄ 1} becomes a decagon {10 ⁄ 1}, so truncating a pentagram {5 ⁄ 2} becomes a doubly-wound pentagon {10 ⁄ 2} (the common factor between 10 and 2 mean we visit each vertex twice to complete the polygon).