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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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