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Trigonometry, Revision Notes


Theorem of Pythagoras

The theorem of Pythagoras says that the largest side squared is equal to the sum of the other two sides squared. The largest side is called the hypotenuse and is always opposite the 90° angle

In right-angle triangles special ratios sin, cos and tan exist between the angles and the lengths of the sides

Sin A =

Cos A =

TanA =

If we’re trying to find the angle A we use the functions

A = ( )

A = ( )

A = ( )

Minutes are the same as degrees except the...

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