Home » Circle Cheat Sheet
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December 3, 2014 
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Circle Cheat Sheet
Concepts Covered
 Standard Equation
 Equation with known center and radius
 Equation with known endpoints of diameter
 General Equation
 Position of a point w.r.t. a Circle
 Equation of Tangents: Slope Form and Point Form
 Length of the Tangent from an External Point
 Equation of Normal: Slope Form and Point Form
 Chord of Contact
 Chord with known MidPoint
 Family of Circles
 Angle of Intersection of Circles
 Orthogonal Intersection
 Radical Axis
 Relative Position of Two Circles
 Common Tangents to Two Circles