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