hipparchus
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Hipparchus is the father of trigonometry.
He defined the spherical triangle
There is no Contribution of Thales in the field of trignometry.........
Hipparchus is the father of trigonometry and he was a Greek astronomer who lived between 190-120 B.C. He is considered as the father of trigonometry, a branch of mathematics which studies the angles of sides of triangles. :)
based on my stock knowledge, i think hipparchus is the father of trigonometry.....