trigonometry was first thought to be used in the 2nd millennium bc.
trigonometry was first thought to be used in the 2nd millennium bc.
when was trigonometry first thought to be used?
2nd millennium bc
the egyptians, on the other hand, used a primitive form of trigonometry for building pyramids in the 2nd millennium bc. the rhind mathematical papyrus, written by the egyptian scribe ahmes (c. 1680–1620 bc), contains the following problem related to trigonometry:









































ahmes' solution to the problem is the ratio of half the side of the base of the pyramid to its height, or the run-to-rise ratio of its face. in other words, the quantity he found for the "seked" is the cotangent of the angle to the base of the pyramid and its face.









































section::::development.:classical antiquity.
history of trigonometry
bullet::::4. universal hyperbolic trigonometry – an algebraic approach based on rational trigonometry.









































bullet::::- rational trigonometry – a reformulation of trigonometry in terms of "spread" and "quadrance" rather than "angle" and "length".









































bullet::::- trigonometry for taxicab geometry









































bullet::::- spacetime trigonometries









































bullet::::- fuzzy qualitative trigonometry









































bullet::::- operator trigonometry









































bullet::::- lattice trigonometry









































bullet::::- trigonometry on symmetric spaces









































section::::higher-dimensions.









































bullet::::- polar sine









































bullet::::- trigonometry of a tetrahedron









































bullet::::- a law of sines for tetrahedra









































bullet::::- simplexes with an "orthogonal corner" - pythagorean theorems for n-simplexes









































bullet::::- de gua's theorem - a pythagorean theorem for a tetrahedron with a cube corner









































section::::trigonometric functions.
generalized trigonometry