Khan Academy

Challenge problems: radius & tangent (K-A)

Determining tangent lines: angles (K-A)

Determining tangent lines: lengths (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)

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)

Geometric constructions: circle-inscribed equilateral triangle (K-A)

Geometric constructions: circle-inscribed regular hexagon (K-A)

Geometric constructions: circle-inscribed square (K-A)

Geometric constructions: triangle-circumscribing circle (K-A)

Geometric constructions: triangle-inscribing circle (K-A)

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

Geometric constructions: circle tangent (K-A)

Congruent shapes & transformations (K-A)

Non-congruent shapes & transformations (K-A)

Congruent triangles & the SSS postulate/criterion (K-A)

Determining congruent triangles (K-A)

Triangle congruence postulates/criteria (K-A)