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  2. Grid plan - Wikipedia

    en.wikipedia.org/wiki/Grid_plan

    New Haven Colony, one of the earliest colonies in America, was designed with a tiny 9-square grid at its founding in 1638. On a grander scale, Philadelphia was designed on a rectilinear street grid in 1682, one of the first cities in North America to use a grid system.

  3. Nine dots puzzle - Wikipedia

    en.wikipedia.org/wiki/Nine_dots_puzzle

    To do so, one goes outside the confines of the square area defined by the nine dots themselves. The phrase thinking outside the box, used by management consultants in the 1970s and 1980s, is a restatement of the solution strategy. According to Daniel Kies, the puzzle seems hard because we commonly imagine a boundary around the edge of the dot ...

  4. Square tiling - Wikipedia

    en.wikipedia.org/wiki/Square_tiling

    In geometry, the square tiling, square tessellation or square grid is a regular tiling of the Euclidean plane. It has Schläfli symbol of {4,4}, meaning it has 4 squares around every vertex. Conway called it a quadrille. The internal angle of the square is 90 degrees so four squares at a point make a full 360

  5. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    The order 9 square is a composite magic square, ... a 3×3 grid in which circular dots of numbers were arranged, such that the sum of the numbers in each row, ...

  6. Edge-matching puzzle - Wikipedia

    en.wikipedia.org/wiki/Edge-matching_puzzle

    TetraVex is a computer game that presents the player with a square grid and a collection of tiles, by default nine square tiles for a 3×3 grid. Each tile has four single-digit numbers, one on each edge. The objective of the game is to place the tiles into the grid in the proper position, completing this puzzle as quickly as possible.

  7. Glossary of Sudoku - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_Sudoku

    The classic 9×9 Sudoku format can be generalized to an N×N row-column grid partitioned into N regions, where each of the N rows, columns and regions have N cells and each of the N digits occur once in each row, column or region. This accommodates variants by region size and shape, e.g. 6-cell rectangular regions. (N×N Sudoku is square).

  8. Lattice graph - Wikipedia

    en.wikipedia.org/wiki/Lattice_graph

    A common type of lattice graph (known under different names, such as grid graph or square grid graph) is the graph whose vertices correspond to the points in the plane with integer coordinates, x-coordinates being in the range 1, ..., n, y-coordinates being in the range 1, ..., m, and two vertices being connected by an edge whenever the corresponding points are at distance 1.

  9. Parti (architecture) - Wikipedia

    en.wikipedia.org/wiki/Parti_(architecture)

    Lonja del Comercio building. The parti [6] of the Lonja del Comercio building in Havana (in plan) is a perfect square and based on the classic 9 square problem that was used, [7] [a] among others, by Peter Eisenman to design some of his houses and Andrea Palladio in the design of many of his villas.