Khan Academy

Determining rotations (K-A)

Rotating shapes: center ≠ (0,0) (K-A)

Rotating shapes (K-A)

Finding a quadrilateral from its symmetries (example 2) (K-A)

Finding a quadrilateral from its symmetries (K-A)

Intro to reflective symmetry (K-A)

Intro to rotational symmetry (K-A)

Determining translations (K-A)

Translating shapes (K-A)

Translation challenge problem (K-A)

Geometry proof problem: congruent segments (K-A)

Geometry proof problem: squared circle (K-A)

Geometry proof problem: midpoint (K-A)

Proof: Diagonals of a parallelogram (K-A)

Proof: Opposite angles of a parallelogram (K-A)

Proof: Opposite sides of a parallelogram (K-A)

Proof: Rhombus diagonals are perpendicular bisectors (K-A)

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

Proof: Rhombus area (K-A)

Proofs concerning equilateral triangles (K-A)

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

Proofs concerning isosceles triangles (K-A)

Congruent shapes & transformations (K-A)

Non-congruent shapes & transformations (K-A)

Corresponding parts of congruent triangles are congruent (K-A)