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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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