It means the measurements and properties of 3 sided shapes such as 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.
The side that the measurement of an angle starts from.
That's the definition of trigonometry. Triangles are completely dependent upon their side lengths, and can be defined by only three values.
The study of the ratios of the sides and angles of triangles in the same plane.
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.
Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.
trigonometry is very imr