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  2. Magic circle (mathematics) - Wikipedia

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

    Magic circles were invented by the Song dynasty (960–1279) Chinese mathematician Yang Hui (c. 1238–1298). It is the arrangement of natural numbers on circles where the sum of the numbers on each circle and the sum of numbers on diameters are identical. One of his magic circles was constructed from the natural numbers from 1 to 33 arranged ...

  3. Magic triangle (mathematics) - Wikipedia

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

    A magic triangle or perimeter magic triangle[1] is an arrangement of the integers from 1 to n on the sides of a triangle with the same number of integers on each side, called the order of the triangle, so that the sum of integers on each side is a constant, the magic sum of the triangle. [1][2][3][4] Unlike magic squares, there are different ...

  4. Chinese mathematics - Wikipedia

    en.wikipedia.org/wiki/Chinese_mathematics

    Li Ye's inscribed circle in triangle:Diagram of a round town Yang Hui's magic concentric circles – numbers on each circle and diameter (ignoring the middle 9) sum to 138 Ceyuan haijing ( Chinese : 測圓海鏡 ; pinyin : Cèyuán Hǎijìng ), or Sea-Mirror of the Circle Measurements , is a collection of 692 formula and 170 problems related to ...

  5. Golden rectangle - Wikipedia

    en.wikipedia.org/wiki/Golden_rectangle

    The respective lengths a, b, and c of the sides of these three polygons satisfy the equation a 2 + b 2 = c 2, so line segments with these lengths form a right triangle (by the converse of the Pythagorean theorem). The ratio of the side length of the hexagon to the decagon is the golden ratio, so this triangle forms half of a golden rectangle. [8]

  6. Formulas for generating Pythagorean triples - Wikipedia

    en.wikipedia.org/wiki/Formulas_for_generating...

    Let x be a positive integer, there is a method to construct all Pythagorean triples that contain x as one of the legs of the right-angled triangle associated with the triple. It means finding all right triangles whose sides have integer measures, with one leg predetermined as a given cathetus. [13] Formulas read as follows.

  7. Yang Hui - Wikipedia

    en.wikipedia.org/wiki/Yang_Hui

    The earliest extant Chinese illustration of 'Pascal's triangle' is from Yang's book Xiangjie Jiuzhang Suanfa (詳解九章算法) [1] of 1261 AD, in which Yang acknowledged that his method of finding square roots and cubic roots using "Yang Hui's Triangle" was invented by mathematician Jia Xian [2] who expounded it around 1100 AD, about 500 years before Pascal.