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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...

    The Pythagorean trigonometric identity, also called simply the Pythagorean identity, is an identity expressing the Pythagorean theorem in terms of trigonometric functions. Along with the sum-of-angles formulae, it is one of the basic relations between the sine and cosine functions. The identity is. As usual, means .

  4. Garfield's proof of the Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Garfield's_proof_of_the...

    Garfield in 1881. Garfield's proof of the Pythagorean theorem is an original proof the Pythagorean theorem invented by James A. Garfield (November 19, 1831 – September 19, 1881), the 20th president of the United States. The proof appeared in print in the New-England Journal of Education (Vol. 3, No.14, April 1, 1876). [1][2] At the time of ...

  5. Pythagoras - Wikipedia

    en.wikipedia.org/wiki/Pythagoras

    The Pythagorean theorem was known and used by the Babylonians and Indians centuries before Pythagoras, [216] [214] [217] [218] but he may have been the first to introduce it to the Greeks. [219] [217] Some historians of mathematics have even suggested that he—or his students—may have constructed the first proof. [220]

  6. Golden Verses - Wikipedia

    en.wikipedia.org/wiki/Golden_Verses

    The Golden Verses Of Pythagoras And Other Pythagorean Fragments. Theosophical Publishing House. Joost-Gaugier, Christiane L. (2007). Measuring Heaven: Pythagoras and his Influence on Thought and Art in Antiquity and the Middle Ages. Cornell University Press. ISBN 978-0-8014-7409-5; Kahn, Charles H. (2001). Pythagoras and the Pythagoreans: A ...

  7. Inverse Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Inverse_Pythagorean_theorem

    In geometry, the inverse Pythagorean theorem (also known as the reciprocal Pythagorean theorem[1] or the upside down Pythagorean theorem[2]) is as follows: [3] Let A, B be the endpoints of the hypotenuse of a right triangle ABC. Let D be the foot of a perpendicular dropped from C, the vertex of the right angle, to the hypotenuse.

  8. Pythagorean means - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_means

    Pythagorean means. A geometric construction of the quadratic mean and the Pythagorean means (of two numbers a and b). Harmonic mean denoted by H, geometric by G, arithmetic by A and quadratic mean (also known as root mean square) denoted by Q. Comparison of the arithmetic, geometric and harmonic means of a pair of numbers.

  9. Plato's problem - Wikipedia

    en.wikipedia.org/wiki/Plato's_Problem

    Plato's problem describes the disparity between input (poverty of the stimulus) and output (grammar). As Plato suggests in the Meno dialogue, the bridge between input (whether limited or lacking) and output is innate knowledge. Poverty of the stimulus is crucial to the Platonic argument and it is a linchpin concept in Chomskyan linguistics.