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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

  3. Square knot (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Square_knot_(mathematics)

    The square knot, drawn as a ribbon knot Square knot = trefoil + trefoil reflection. Sticks depicted. In knot theory, the square knot is a composite knot obtained by taking the connected sum of a trefoil knot with its reflection. It is closely related to the granny knot, which is also a connected sum of two trefoils. Because the trefoil knot is ...

  4. Numberjacks - Wikipedia

    en.wikipedia.org/wiki/Numberjacks

    Numberjacks centres on the adventures of a group of anthropomorphic numbers. The main Numberjacks; Three, Four, Five, and Six, are the main protagonists of the series. They normally spend their everyday lives inside a sofa until a call comes in from real-life child Agents, who report problems that need solving.

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  6. Square number - Wikipedia

    en.wikipedia.org/wiki/Square_number

    Square number 16 as sum of gnomons. In mathematics, a square number or perfect square is an integer that is the square of an integer; [1] in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals 3 2 and can be written as 3 × 3.

  7. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    The square has Dih 4 symmetry, order 8. There are 2 dihedral subgroups: Dih 2, Dih 1, and 3 cyclic subgroups: Z 4, Z 2, and Z 1. A square is a special case of many lower symmetry quadrilaterals: A rectangle with two adjacent equal sides; A quadrilateral with four equal sides and four right angles; A parallelogram with one right angle and two ...

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