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Interior secants
Angle=1/2 (L+S)
Exterior secants
Angle=1/2 (L-S)
Secant and tangent intersects
Angle=1/2 (L-S)
Two tangents intersect
Angle=1/2 (L-S)
Secant and tangent intersects at point of tangency
Angle=1/2 (arc)
Find arc length
Degrees/360 × 2(pi)r
Degrees to radians
Degrees x pi/180, leave pi in answer
Radians to degrees
Multiply by 180/pi
Equation of a circle
(x-h)²+(y-h)²=r²