That's the definition of trigonometry. Triangles are completely dependent upon their side lengths, and can be defined by only three values.
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If you mean trigonometry then it is the working properties of triangles.
It is trigonometry.
In Geometry, you learn about triangles. In Trigonometry you learn even more about triangles.
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.
Ancient Egyptian and Babylonian mathematicians lacked the concept of an angle measure, but they studied the ratios of the sides of similar triangles and discovered some properties of these ratios. The ancient Nubians used a similar methodology.