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Basic Trigonometry

- An Introduction

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

Trigonometry

Ratio Definitions

- Sin opposite leg / hypotenuse
- Cos adjacent leg / hypotenuse
- Tan opposite leg / adjacent leg

Reciprocals

Reciprocal Ratio Definitions

- Cot 1 / Tan
- Sec 1 / Cos
- Csc 1 / Sin

Alternate Reciprocal Definitions

- Cot adjacent leg / opposite leg
- Sec hypotenuse / adjacent leg
- Csc hypotenuse / opposite leg

Examples

Y

- Sin X b / c
- Cos X a / c
- Tan X b / a

C

b

X

a

Reciprocal Examples

Y

- Cot X a / b
- Sec X c / a
- Csc X c /b

c

b

X

a

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