1. Basic Trig Functions

2. Sine The ratio of the side opposite the angle to the hypotenuse.

3. Cosine The ratio of the side adjacent the angle to the hypotenuse.

4. Tangent The ratio of the side opposite the angle to the adjacent side.

5. A Nifty Mnemonic So, how can I remember what sides make up each ratio?
Try saying hello to Chief SOHCAHTOA!
S – Sine is
O – Opposite over
H – Hypotenuse
C – Cosine is
A – Adjacent over
T – Tangent is
A – Adjacent

6. Examples
The examples on the slides that follow include the answers in simplest rational form. This means the answer was a fraction that may or may not have been reduced.