Khan Academy

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

Geometric constructions: circle tangent (K-A)

i as the principal root of -1 (K-A)

Intro to the imaginary numbers Notes (K-A)

Intro to the imaginary numbers Video (K-A)

Powers of the imaginary unit Notes (K-A)

Powers of the imaginary unit Video (K-A)

Simplifying roots of negative numbers (K-A)

Intro to complex numbers Notes (K-A)

Intro to complex numbers Video (K-A)

Plotting numbers on the complex plane (K-A)

The complex plane Notes (K-A)

Adding complex numbers (K-A)

Subtracting complex numbers (K-A)

Complex number operations review (K-A)

Multiplying complex numbers Notes (K-A)

Multiplying complex numbers Video (K-A)

Intro to conic sections (K-A)

Features of a circle from its graph (K-A)

Graphing circles from features (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)

Circle equation review (K-A)

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