Trigonometric ratios relate the angles of a triangle to the length of the sides.
Given a triangle as shown below
The side opposite the angle θ is referred to as the Opposite and the side opposite the right-angle is referred to as the Hypotenuse. The remaining side is the Adjacent.
The Sine ratio is given as
[tex]\sin \theta=\frac{\text{Opposite}}{\text{Hypotenuse}}[/tex]
The Tangent ratio is given as
[tex]\tan \theta=\frac{Opposite}{Adjacent}[/tex]
The Cosine ratio is given as
[tex]\cos \theta=\frac{\text{Adjacent}}{\text{Hypotenuse}}[/tex]
A mnemonic to easily remember is SOH CAH TOA.
