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  2. Tangram - Wikipedia

    en.wikipedia.org/wiki/Tangram

    The first of these was Mandarinen (About the Chinese Game). This was written by a student at Copenhagen University, which was a non-fictional work about the history and popularity of tangrams. The second, Det nye chinesiske Gaadespil (The new Chinese Puzzle Game), consisted of 339 puzzles copied from The Eighth Book of Tan, as well as one ...

  3. Four square - Wikipedia

    en.wikipedia.org/wiki/Four_square

    Four square has inspired other similar games. One example is nine square, which uses a 3-by-3 grid instead of a 2-by-2 grid. [ 8 ] The 9 square is the middle and the ball is served from this position.

  4. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent paradox is explained by the fact that the side of the new large square is a little smaller than the original one. If θ is the angle between two opposing sides in each quadrilateral, then the ratio of the two areas is given by sec 2 θ. For θ = 5°, this is approximately 1.00765, which corresponds to a difference of about 0.8%.

  5. List of two-dimensional geometric shapes - Wikipedia

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

    Quadrilateral – 4 sides Cyclic quadrilateral; Kite. Rectangle; Rhomboid; Rhombus; Square (regular quadrilateral) Tangential quadrilateral; Trapezoid. Isosceles trapezoid; Trapezus; Pentagon – 5 sides; Hexagon – 6 sides Lemoine hexagon; Heptagon – 7 sides; Octagon – 8 sides; Nonagon – 9 sides; Decagon – 10 sides; Hendecagon – 11 ...

  6. JumpStart - Wikipedia

    en.wikipedia.org/wiki/JumpStart

    Jumpstart Preschool (2nd), Jumpstart First Grade (3rd), Jumpstart Kindergarten (7th), and Jumpstart Second Grade (8th) were among the top-selling home-education software across 13 software retail chains in the week ending May 1, 1999. [36] By 2002, the series sold over 13 million units. [37]

  7. Report: 72% of Washington eighth graders not proficient in math

    www.aol.com/report-72-washington-eighth-graders...

    Washington eighth graders also experienced a significant loss in math proficiency during the pandemic, according to the report. The share of eighth grade students proficient in math from 2019 to ...