Trigonometry is a methodology for finding some unknown elements of a triangle (or other geometric shapes) provided the data includes a sufficient amount of linear and angular measurements to define a shape uniquely. For example, two sides a and b of a triangle and the angle they include define the triangle uniquely. The third side c can then be found from the Law of Cosines while the angles α and β are determined from the Law of Sines.
The Law Of Sines:a/sinA, b/sinB, c/sinC. The Law of Cosines: a/cosA, b/cosB, c/cosC.
Examples
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