Khan Academy

Radians & degrees (K-A)

Geometric constructions: circle tangent (example 2) (K-A)

Radians to degrees (K-A)

Geometric constructions: circle tangent (K-A)

Subtended angle from arc length (K-A)

Proof: Radius is perpendicular to tangent line (K-A)

Proof: Segments tangent to circle from outside point are congruent (K-A)

Tangents of circles problem (example 1) (K-A)

Tangents of circles problem (example 2) (K-A)

Tangents of circles problem (example 3) (K-A)

Circle equation review (K-A)

Features of a circle from its expanded equation (K-A)

Features of a circle from its standard equation (K-A)

Graphing a circle from its standard equation (K-A)

Writing standard equation of a circle (K-A)

Adding complex numbers (K-A)

Multiplying complex numbers (K-A)

Multiplying complex numbers-notes (K-A)

Plotting numbers on the complex plane (K-A)

Powers of the imaginary unit (K-A)

Powers of the imaginary unit-video (K-A)

Subtracting complex numbers (K-A)

The complex plane (K-A)

Complex number conjugates (K-A)

Dividing complex numbers (K-A)