5.2 Right Triangle Trigonometry
the six trigonometric function
Subtopic
Fundamental identities
Trigonometric Ratios:
Sin (A) = Opposite/Hypotenuse
Cos (A) = Adjacent/Hypotenuse
Tan (A) = Opposite/Adjacent
Definition of Trigonometry: The branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
Trigonometric Function and Complements
The Pythagorean trigonometric identity is a trigonometric identity expressing the Pythagorean theorem in terms of trigonometric functions. Along with the sum-of-angles formulae, it is one of the basic relations between the sine and cosine functions.