An important contribution by Menelaus of Alexandria was his works on geodesics.
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He defined the spherical triangle
well, nothing is for sure but it is said that Hipparchus, a Greek geographer. its kind of odd though. but they say that they have evidence of his systematic use of trigonometry. Also Menelaus and Ptolomy helped in the development of trigonometry.
Joseph Greenhowe
It was Pythagoras
The branch of mathematics called trigonometry studies the relationships of lengths and angles of triangles. Three mathematicians who contributed to the development of trigonometry are: Pythagoras, Joseph Fourier, Norman J. Wildberger.