# Hipparchus, Menelaus, Ptolemy and Greek Trigonometry Essay

# Hipparchus, Menelaus, Ptolemy and Greek Trigonometry Essay

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Menelaus

Menelaus of Alexandris (c. 70 – 140 A.D) was a Greek mathematician and astronomer. Little is known of Menelaus’s life. After spending his youth in Alexandria, he most likely moved to Rome. Both Pappus of Alexandria and Proc...

... middle of paper ...

...own. The function sin x is equivalent to ½ (chord 2x) and cos x is equivalent to ½ chord(180 – 2x). The Almagest also contains trigonometric theorems equivalent to the present day law of sines and compound-angle and half-angle identities. Hipparchus probably knew of these and even possible invented them (The Beginning of Trigonometry).

References

An Introduction to the History of Mathematics. 6th ed. Pacific Grove: Brooks/Cole, 1990. Print

Hipparchus. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Hipparchus

Hunt, J. (n.d.). The Beginnings of Trigonometry. Retrieved from http://www.math.rutgers.edu/~cherlin/History/Papers2000/hunt.html

Menelaus of Alexandria. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Menelaus_of_Alexandria

Ptolemy. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Ptolemy

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