Brief note on histor of TRIGONOMETRY..
Answers
Step-by-step explanation:
In the earliest times, when at sea all terrestrial landmarks had disappeared, the last means available to mariners were the stars. Trigonometry was developed early in the history of mankind, because it allowed a reading of heaven essential to navigation.
As stated by Aristotle and Ptolemy, the stars hung in the sphere of « fixed ». It could therefore be relied upon to keep the North. Astronomers, sailors and architects were thus the first developers of this art of the angles of the triangle.
Trigonometry did not stay very long limited to navigation. Soon, architects, engineers and mathematicians quickly understood the interest of this new branch of geometry.
D’Alembert, the great french mathematician of the Encyclopedia, gave his definition of trigonometry in 1751: it is « the art of finding the unknown sides of a triangle by means of those (parts) that knows. «