Proof of the Pythagorean theorem

495 BCE

Proof of the
Pythagorean theorem

The book of science

Tom Sharp


Pythagoras geometry

Proof of the Pythagorean theorem

Thales’ theorem

Irrational triples


The X and Y axes in the Cartesian coordinate system form right angles, and the line between the origin and any point not on either X or Y axis is the hypotenuse of a right triangle. The sine and cosine in modern trigonometry are ratios of the hypotenuse with the opposite and adjacent sides of a right triangle whose hypotenuse starts at the origin of the X and Y axes and ends at the circumference of the unit circle whose center is the origin. The Greek root of the word trigonometry is trigōnon, an ancient triangular lyre or harp. The vibration of musical strings create standing waves and their form can be expressed using trigonometric functions.

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