The Arabs invented the modern math of trigonometry. They used Ancient Greek proofs (such as those made by Pythagoras and Demosthenes) to discover that the relationships between the lengths of sides of a right angle triangle were consistent when the angles were consistent. They proved methods to derive the proper value relationships, resulting in the trigonometry tables that have now been plugged into in every scientific calculator.
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hipparchus
He defined the spherical triangle
There is no Contribution of Thales in the field of trignometry.........
The contributions of Arab scholars was trigonometry. They also contributed other thing such as their intelligence . :D :)
An important contribution by Menelaus of Alexandria was his works on geodesics.