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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 two-dimensional geometric shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_two-dimensional...

    Digon – 2 sides; Triangle – 3 sides ... Decagon – 10 sides; ... Megagon - 1,000,000 sides; Star polygon – there are multiple types of stars

  4. Heptadecagon - Wikipedia

    en.wikipedia.org/wiki/Heptadecagon

    Based on the construction of the regular 17-gon, one can readily construct n-gons with n being the product of 17 with 3 or 5 (or both) and any power of 2: a regular 51-gon, 85-gon or 255-gon and any regular n-gon with 2 h times as many sides.

  5. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    If m is 2, for example, then every second point is joined. If m is 3, then every third point is joined. The boundary of the polygon winds around the center m times. The (non-degenerate) regular stars of up to 12 sides are: Pentagram – {5/2} Heptagram – {7/2} and {7/3} Octagram – {8/3} Enneagram – {9/2} and {9/4} Decagram – {10/3}

  6. Pentadecagon - Wikipedia

    en.wikipedia.org/wiki/Pentadecagon

    There are three regular star polygons: {15/2}, {15/4}, {15/7}, constructed from the same 15 vertices of a regular pentadecagon, but connected by skipping every second, fourth, or seventh vertex respectively.

  7. Hexadecagon - Wikipedia

    en.wikipedia.org/wiki/Hexadecagon

    Coxeter states that every zonogon (a 2m-gon whose opposite sides are parallel and of equal length) can be dissected into m(m-1)/2 parallelograms. [ 4 ] In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi.

  8. Tetradecagon - Wikipedia

    en.wikipedia.org/wiki/Tetradecagon

    Coxeter states that every zonogon (a 2m-gon whose opposite sides are parallel and of equal length) can be dissected into m(m-1)/2 parallelograms. [5] In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi.

  9. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    Note 2: In a kite, one diagonal bisects the other. The most general kite has unequal diagonals, but there is an infinite number of (non-similar) kites in which the diagonals are equal in length (and the kites are not any other named quadrilateral).