Home » Circle Cheat Sheet
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Create Date | December 3, 2014 |

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## 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