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
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.
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
Euclidean geometry
…are proved, for example, "In any triangle, two angles taken together in any manner are less than two right angles." (Book I proposition 17) and the Pythagorean theorem "In right-angled triangles the square on the side subtending the right angle is equal to the squares on the sides containing the right angle." (Book…
The Plimpton 322 tablet records Pythagorean triples from Babylonian times.
Geometric proof of the Pythagorean theorem from the Zhoubi Suanjing