Trigonometric Functions

- If in a circle of radius
*r*, an arc of length*l*subtends an angle of*θ*radians, then*l*=*r**θ*. - Radian measure =
- Degree measure =

- A degree is divided into 60 minutes and a minute is divided into 60 seconds. One sixtieth of a degree is called a minute, written as 1', and one sixtieth of a minute is called a second, written as1".

Thus, 1° = 60' and 1' = 60"

**Signs of trigonometric functions in different quadrants:**

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