According to research by the University of New South Wales (Aug 2017), the Babylonians were far ahead of the Greek who were previously believed to be the earliest. The Plimpton 322 tablet is approx 3700 years old, about 1500 years older than the Greek astronomer, Hipparchus who until now was considered to be the father of trigonometry.
Thales
Trigonometry is used effectively in electronics.
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"
It is certainly used in calculus, just as calculus can be used in trigonometry.
SoH: used for finding the sine of a triangle in trigonometry: Opposite/HypotenuseCaH: used for finding the cosine of a triangle in trigonometry: Adjacent/HypotenuseToA: used for finding the tangent of a triangle in trigonometry: Opposite/Adjacent
Trigonometry is used in the design and construction of buildings, cars, planes, and many other objects. Trigonometry is used in physics and engineering whenever forces, waves, fields, and vectors are involved. Trigonometry is used in music and acoustics to design speakers, instruments, and concert halls. Trigonometry is used to coordinate launches OS space shuttles. Trigonometry is used to navigate ships and planes. Nearly every part of modern life uses trigonometry in some way.
Angles were known before trigonometry. Trigonometry was the study of angles and their relationship to shapes.
Hittites
The first recorded use of trigonometry came from the Hellenistic mathematician Hipparchus
the Romans did
The Babylonians and the Egyptians.
Archaeologists use Trigonometry to divide up the excavation sites properly into equal areas of work. They can also use it to help them identify different tools used by the civilization are they are excavating. They can also use it to measure the distance from underground water systems near their dig site.