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  2. 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.

  3. Pythagorean trigonometric identity - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_trigonometric...

    In this way, this trigonometric identity involving the tangent and the secant follows from the Pythagorean theorem. The angle opposite the leg of length 1 (this angle can be labeled φ = π/2 − θ) has cotangent equal to the length of the other leg, and cosecant equal to the length of the hypotenuse. In that way, this trigonometric identity ...

  4. Zhoubi Suanjing - Wikipedia

    en.wikipedia.org/wiki/Zhoubi_Suanjing

    A large part of this involves analysis of solar declination in the Northern Hemisphere at various points throughout the year. [ 1 ] 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 ...

  5. 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 ...

  6. 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]

  7. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Kodaira vanishing theorem (complex manifold) Koebe 1/4 theorem (complex analysis) Kolmogorov extension theorem (stochastic processes) Kolmogorov's three-series theorem (mathematical series) Kolmogorov–Arnold representation theorem (real analysis, approximation theory) Kolmogorov–Arnold–Moser theorem (dynamical systems) Kőnig's theorem ...

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