The distance formula using Pythagorean theorem: trig values trig formulas triangle abc trigonometric concepts trigonometric formulas.
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Optics deals with light waves, and all waves relate in some way to trigonometry. Also, the reflection and refraction of light involves trigonometry.
It will require many pages of a text-book to show the area- formulae for all figures.
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Through the usage of trigonometry and a protractor.