1. Basic Trigonometry
An Introduction

2. Right Triangle Anatomy
The legs are the 2 sides that form the right angle
The side opposite the right angle is called the hypotenuse.
hypotenuse
leg
leg

3. Trigonometry

4. Ratio Definitions Sin = opposite leg / hypotenuse
Cos = adjacent leg / hypotenuse
Tan = opposite leg / adjacent leg

5. Reciprocals

6. Reciprocal Ratio Definitions
Cot = 1 / Tan
Sec = 1 / Cos
Csc = 1 / Sin

7. Alternate Reciprocal Definitions
Cot = adjacent leg / opposite leg
Sec = hypotenuse / adjacent leg
Csc = hypotenuse / opposite leg

8. Examples Y
Sin X = b / c
Cos X = a / c
Tan X = b / a C b X a

9. Reciprocal Examples Y
Cot X= a / b
Sec X = c / a
Csc X = c /b c b X a