Circles Review

part(part)=part(part)

outside(whole)=outside(whole)

tangent²=outside(whole)

tangent=tangent

Central Angles: angle = arc

Inscribed Angles: angle = 1/2arc

Interior Angles: angle = 1/2(arc + arc)

Exterior Angles: angle=1/2(big arc - little arc)

 $\theta$  is the central angle

r is the radius

Remember if they gave you the diameter, divide by 2 to get the radius

(h,k) is the center, but remember to make the signs OPPOSITE.

r is the radius

To WRITE the equation: square the radius

FROM the equation: take the square root of r²