CIRCULAR MEASURE

CIRCULAR MEASURE

1. Converting units

   • radian > degree
     • x π/180
   • degree > radian
     • x 180/π

2. Length of Arc

   • L = rθ
     • θ in radian

3. Shaded Segment

   • + AC
     • rθ + 2 rsinθ/2
       • θ in rad
       • θ in degree because there is trigo
         • TRiGO : sin,cos,tan
   • Perimeter
   • Area
     • r²θ - sinθ
       • θ in rad
       • θ in degree because there is trigo
         • TRIGO : sin,cos,tan

4. Area of a Sector

   • r²θ

5. INFO

   • 360° = 2π rad
   • 180° = π rad

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