If you mean trigonometry then it is the working properties of triangles.
It is a number - in trigonometry or elsewhere.
how can trigonometry use in metallurgy
Trigonometry is used effectively in electronics.
I can give you several sentences.I have to take trigonometry next year.Trigonometry relates to triangles.I never did understand how to do that trigonometry problem.
If you mean trigonometry then it is the working properties of triangles.
Measurements of a trigon (or triangle).
There are many formulae in trigonometry, not just three. So the question cannot be answered without knowing which three you mean.
plane trigonometry spherical trigonometry
The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.
tripod triangle trigonometry triple triphasic
It is a number - in trigonometry or elsewhere.
TRIGONOMETRY
Hipparchus is the father of trigonometry.
Trigonometry is applied in construction and building, as trigonometry measures right angled triangles.
Plane trigonometry is trigonometry carried out in (on) a plane. This could be contrasted with spherical trigonometry, which is trigonometry carried out on the surface of a sphere. Certainly there are some other more complex forms of trig.
Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.