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Hipparchus was recognized as the first mathematician known to have possessed a trigonometric table, which he needed when computing the eccentricity of the orbits of the Moon and Sun. He tabulated values for the chord function, which gives the length of the chord for each angle. He did this for a circle with a circumference of 21600 and a radius (rounded) of 3438 units: this circle has a unit length of 1 arc minute along its perimeter. He tabulated the chords for angles with increments of 7.5°.

Q: What is the contribution of hipparchuss in trigonometry?

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hipparchus

He defined the spherical triangle

There is no Contribution of Thales in the field of trignometry.........

An important contribution by Menelaus of Alexandria was his works on geodesics.

Centuries ago, Islam created the mathematics of 'Trigonometry'.

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hipparchus

He defined the spherical triangle

He introduced coordinated geometry

There is no Contribution of Thales in the field of trignometry.........

spherical and plane trigonometry? :p

An important contribution by Menelaus of Alexandria was his works on geodesics.

Centuries ago, Islam created the mathematics of 'Trigonometry'.

Ptolemy's major contribution to trigonometry was his work on chords in a circle, which led to the development of the trigonometric functions sine, cosine, and tangent. He compiled a table of chords that facilitated trigonometric calculations and navigational measurements. Ptolemy's work influenced the development of trigonometry in the medieval Islamic world and later in Europe.

Thales, Democritus, Pythagoras, Aristotle, Archimedes, Euclid, Erastosthenes, Hipparchus,

Bartholomaeus Pitiscus is best known for his book called Trigonometria which was first published in Heidelburg in 1595. It consists of work on plane and spherical trigonometry. The book had the first recorded mention of the word "trigonometry".

One major contribution was that of the Pythagorean Theorem. a^2 + b^2 = c^2