Circular Measure
- Radian measure:
- π = 180°
- 2π = 360°
- Degree to Rad = θ × π/180
- Rad to degree = radian × 180/π
- Arc length: s = rθ
- Area of sector: A = ½ r² Ø
- where Ø is the angle in radians subtended by the arc at the center of the circle
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