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...
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...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).
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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