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  2. File:Diagonal and co-diagonal.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Diagonal_and_co...

    Diagonal_and_co-diagonal.pdf (618 × 93 pixels, file size: 51 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

  3. Eight queens puzzle - Wikipedia

    en.wikipedia.org/wiki/Eight_queens_puzzle

    There are 92 solutions. The problem was first posed in the mid-19th century. In the modern era, it is often used as an example problem for various computer programming techniques. The eight queens puzzle is a special case of the more general n queens problem of placing n non-attacking queens on an n×n chessboard.

  4. Euler brick - Wikipedia

    en.wikipedia.org/wiki/Euler_brick

    If (a, b, c) is a solution, then (ka, kb, kc) is also a solution for any k.Consequently, the solutions in rational numbers are all rescalings of integer solutions. Given an Euler brick with edge-lengths (a, b, c), the triple (bc, ac, ab) constitutes an Euler brick as well.

  5. Dividing a circle into areas - Wikipedia

    en.wikipedia.org/wiki/Dividing_a_circle_into_areas

    The number of points (n), chords (c) and regions (r G) for first 6 terms of Moser's circle problem. In geometry, the problem of dividing a circle into areas by means of an inscribed polygon with n sides in such a way as to maximise the number of areas created by the edges and diagonals, sometimes called Moser's circle problem (named after Leo Moser), has a solution by an inductive method.

  6. Tangential quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Tangential_quadrilateral

    [17]: p.169 [28] In the solution to his problem, a similar characterization was given by Vasilyev and Senderov. If h 1, h 2, h 3, and h 4 denote the altitudes in the same four triangles (from the diagonal intersection to the sides of the quadrilateral), then the quadrilateral is tangential if and only if [5] [28]

  7. Grasshopper (chess) - Wikipedia

    en.wikipedia.org/wiki/Grasshopper_(chess)

    The grasshopper is a fairy chess piece that moves along ranks, files, and diagonals (like a queen) but only by hopping over another piece.The piece to be hopped may be of either color and any distance away, but the grasshopper must land on the square immediately beyond it in the same direction.

  8. Hendecagon - Wikipedia

    en.wikipedia.org/wiki/Hendecagon

    The dihedral symmetries are divided depending on whether they pass through vertices (d for diagonal) or edges (p for perpendiculars), and i when reflection lines path through both edges and vertices. Cyclic symmetries in the middle column are labeled as g for their central gyration orders.

  9. Ulam spiral - Wikipedia

    en.wikipedia.org/wiki/Ulam_spiral

    Diagonal, horizontal, and vertical lines in the number spiral correspond to polynomials of the form = + + where b and c are integer constants. When b is even, the lines are diagonal, and either all numbers are odd, or all are even, depending on the value of c. It is therefore no surprise that all primes other than 2 lie in alternate diagonals ...