<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Early study of triangles can be traced to the 2nd millennium BC, in Egyptian mathematics (Rhind Mathematical Papyrus) and Babylonian mathematics . Systematic study of trigonometric functions began in Hellenistic mathematics, reaching India as part of Hellenistic astronomy . In Indian astronomy, the study of trigonometric functions flourished in the Gupta period, especially due to Aryabhata (sixth century CE). During the Middle Ages, the study of trigonometry continued in Islamic mathematics, hence it was adopted as a separate subject in the Latin West beginning in the Renaissance with Regiomontanus . The development of modern trigonometry shifted during the western Age of Enlightenment, beginning with 17th - century mathematics (Isaac Newton and James Stirling) and reaching its modern form with Leonhard Euler (1748). </P> <P> The term "trigonometry" was derived from Greek τρίγωνον trigōnon, "triangle" and μέτρον metron, "measure". </P>

When was trigonometry first thought to be used