He defined the spherical triangle
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An important contribution by Menelaus of Alexandria was his works on geodesics.
hipparchus
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.
There is no Contribution of Thales in the field of trignometry.........
Centuries ago, Islam created the mathematics of 'Trigonometry'.