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When a circle's diameter is 1 unit, its circumference is pi (∏) units.

Circumference = ∏ * diameter
Circumference = 2∏ * radius

∏ = 3.14159



sin(angle)=O/H
cos(angle)=A/H
tan(angle)=O/A



degrees=radians*(180/∏)
radian=degrees*(∏/180)
   

  
    

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