Question

What made the Chola administration strong and effective?
Who started trigonometry?​

Answer 1

Answer:

The Cholas built a strong navy and even conquered Sri lanka, ;arts of south east asia  and the islands of maldives and lakshwadeep and helped in the spread of indian culture to foreign countries.The chola empire rose as a supreme power under the grestest chola king rajaraja1. he pursued a policy of conquest.The Babylonians could measure angles, and are believed to have invented the division of the circle into 360º. However, it was the Greeks who are seen as the original pioneers of trigonometry. A Greek mathematician, Euclid, who lived around 300 BC was an important figure in geometry and trigonometryHipparchus of Nicaea

The first trigonometric table was apparently compiled by Hipparchus of Nicaea (180 – 125 BCE), who is now consequently known as "the father of trigonometry." Hipparchus was the first to tabulate the corresponding values of arc and chord for a series of angles.