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  2. Pre-algebra - Wikipedia

    en.wikipedia.org/wiki/Pre-algebra

    A visual proof of the Pythagorean theorem. Pre-algebra is a common name for a course taught in middle school mathematics in the United States, usually taught in the 6th, 7th, 8th, or 9th grade. [1] The main objective of it is to prepare students for the study of algebra. Usually, Algebra I is taught in the 8th or 9th grade. [2]

  3. Zhoubi Suanjing - Wikipedia

    en.wikipedia.org/wiki/Zhoubi_Suanjing

    At one point during its discussion of the shadows cast by gnomons, the work presents a form of the Pythagorean theorem known as the gougu theorem (勾股 定理) [14] from the Chinese names—lit. 'hook' and 'thigh'—of the two sides of the carpenter or try square. [15]

  4. Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_theorem

    In mathematics, the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle.It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.

  5. Bride's Chair - Wikipedia

    en.wikipedia.org/wiki/Bride's_Chair

    The Bride's chair proof of the Pythagorean theorem, that is, the proof of the Pythagorean theorem based on the Bride's Chair diagram, is given below. The proof has been severely criticized by the German philosopher Arthur Schopenhauer as being unnecessarily complicated, with construction lines drawn here and there and a long line of deductive ...

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Many early texts mention Pythagorean triples and so, by inference, the Pythagorean theorem seems to be the most ancient and widespread mathematical concept after basic arithmetic and geometry. It is in Babylonian mathematics that elementary arithmetic ( addition , subtraction , multiplication , and division ) first appear in the archaeological ...

  7. Pythagorean addition - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_addition

    Repeated Pythagorean addition can find the diameter of a rectangular cuboid. This is the longest distance between two points, the length of the body diagonal of the cuboid. For a cuboid with side lengths a {\displaystyle a} , b {\displaystyle b} , and c {\displaystyle c} , this length is a ⊕ b ⊕ c {\displaystyle a\oplus b\oplus c} .

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