because the greek started trig 2000 years ago to work out where they were using the stars
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Hipparchus, who was a Greek astronomer
"Trigonometry" comes from the Greek words trigonon and metron, and roughly translates to "the measurement of angles".
how can trigonometry use in metallurgy
One example of an astronomer's use of trigonometry is determining the distance to a star by triangulation.
Mechanics use trigonometry to find angles mostly used in body or chassis work.