Where was trigonometry first thought to be used?
Trigonometry was first used by the ancient Babylonians and
Egyptians. Babylonians used it primarily in their astronomical
calculations and there is some debate over whether this was
actually trigonometry or some other form of calculation. However,
the Egyptians did use a primitive form of trigonometry while
building the pyramids. A scribe known as Ahmes actually performed a
trigonometric solution in his "The Rhind Mathematical Papyrus"