With triangles and rules about them.
You can use trigonometry such as cos and tan
Anyone who knows more trigonometry than you and is able to convey that information effectively. A person with loads of qualifications does not necessarily make a teacher.
plane trigonometry spherical trigonometry
The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.
Hipparchus is the father of trigonometry.
It is a number - in trigonometry or elsewhere.
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.
A line in geometry has length (and location) but no width or depth. It's not itself a trigonometrical "being" but join 3 straight lines to make a Triangle, and Hey Presto! - you have Trigonometry!
Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.
trigonometry is very imr