Say you want a bridge 400 m long. It will consist of 400 1 meter upside down triangles. Wait...it's a triangle, therefore you need to know how much material the other sides are! Well, worry know more, there are trig functions on calculators!
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Students are taught trigonometry so they meet the needs in architecture, astronomy and in other fields because trigonometry is the branch of Maths and maths is being used everywhere.
Trigonometry is used in everyday life in various ways. It is used in navigation to calculate distances and angles, in architecture and engineering to design structures and determine angles for construction, and in physics and mechanical engineering to analyze forces and motion. Trigonometry is also used in fields such as astronomy, music, and electrical circuits.
There are many formulae in trigonometry, not just three. So the question cannot be answered without knowing which three you mean.
It is certainly used in calculus, just as calculus can be used in trigonometry.
The distance formula using Pythagorean theorem: trig values trig formulas triangle abc trigonometric concepts trigonometric formulas.