x/pi*r^2=angle/360 - Area of a Sector, x/2pi*r=angle/360 - Arc Length, b-s /2=a - Outside the Circle, 1/2* Big Arc - On the Circle, b+s /2=a - Inside the Circle, m of angle O=arc AB - Central Angle, Opposite Angles = 180 - Inscribed Quadrilaterals,

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