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• Create Date December 3, 2014
• Last Updated April 8, 2017

Circle Cheat Sheet

Circle Cheat Sheet

Concepts Covered

• Standard Equation
• Equation with known center and radius
• Equation with known end-points 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 Mid-Point
• Family of Circles
• Angle of Intersection of Circles
• Orthogonal Intersection
• Radical Axis
• Relative Position of Two Circles
• Common Tangents to Two Circles