Khan Academy

Proof: The diagonals of a kite are perpendicular (K-A)

Angles in a triangle sum to 180° proof (K-A)

Proofs concerning equilateral triangles (K-A)

Proofs concerning isosceles triangles (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)

Triangle congruence review (K-A)

Why SSA isn't a congruence postulate/criterion (K-A)

Corresponding angles in congruent triangles (K-A)

Finding angles in isosceles triangles (example 2) (K-A)

Finding angles in isosceles triangles (K-A)

Isosceles & equilateral triangles problems (K-A)

Intro to angle bisector theorem (K-A)

Using the angle bisector theorem (K-A)

Similar shapes & transformations (K-A)

Determining similar triangles (K-A)

Intro to triangle similarity (K-A)

Proving slope is constant using similarity (K-A)

Triangle similarity postulates/criteria (K-A)

Triangle similarity review (K-A)

Geometry word problem: a perfect pool shot (K-A)

Geometry word problem: Earth & Moon radii (K-A)