Pythagorean theorem
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In mathematics, the Pythagorean theorem or Pythagoras's 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
The Plimpton 322 tablet records Pythagorean triples from Babylonian times.
Geometric proof of the Pythagorean theorem from the Zhoubi Suanjing
Euclidean geometry
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Euclidean geometry is a mathematical system attributed to Euclid, an ancient Greek mathematician, which he described in his textbook on geometry, Elements. Euclid's approach consists in assuming a sma
Pythagorean theorem
…In mathematics, the Pythagorean theorem or Pythagoras's 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…
Detail from Raphael's The School of Athens featuring a Greek mathematician – perhaps representing Euclid or Archimedes – using a compass to draw a geometric construction.
3D CAD model
PCB of a DVD player
NASA Cassegrain, extremely high gain ~70 dBi.