CIRCLES

1. TANGENT

1.1. tangent form

1.2. tangent from external point

1.3. point form

1.4. director circle

1.5. quadrilateral from tangents

1.6. equation of pair of tangents

1.7. chord

1.8. normal to a circle

1.9. length of a tangent

2. FAMILY OF CIRCLES

2.1. 2 circles

2.2. circle and line

2.3. line and a point

3. EQUATION OF A CIRCLE

3.1. general equation

3.1.1. 1

3.1.2. 2

3.1.3. 3

3.2. parametric form

3.2.1. 1

3.3. diameter form

3.3.1. q

3.4. circle and coordinate axis

3.4.1. 1

3.4.1.1. 2

3.4.2. 2

3.4.3. 3

3.4.4. 4

3.5. point and coordinate axis

4. TWO CIRCLES

4.1. 1

4.1.1. length

4.1.2. length

4.2. 2

4.2.1. common tangent

4.2.2. common chord

4.3. 4

4.4. 3

4.4.1. orthogonality

4.5. 5