He introduced coordinated geometry
nothing
hipparchus
Rene Descartes initiated the process in which algebra is thought upon. His major contribution was making me have to do this pointless essay.
Rene Descartes invented the famous Cartesian coordinate system.He worked in the field of analytic geometry.
Rene desscartes was the father of mathematics.
He defined the spherical triangle
DESCARTES Rule in math class. (geometry and up!)
== == Oddly enough, the place now called Descartes. Initially called La Haye en Touraine, the town was renamed La Haye-Descartes in 1802 in his honour, and then renamed again to Descartes in 1967.
There is no Contribution of Thales in the field of trignometry.........
solved pi...
Ptolemy created the earliest tables of trigonometry functions that were found. His mathematical methods have been used to solve problems in astronomy.
spherical and plane trigonometry? :p