Congruence videos

Segment congruence equivalent to having same length

Congruent shapes & transformations

Non-congruent shapes & transformations

Angle congruence equivalent to having same measure

Proving the SSS triangle congruence criterion using transformations

Proving the ASA and AAS triangle congruence criteria using transformations

Proving the SAS triangle congruence criterion using transformations

Why SSA isn't a congruence postulate/criterion

Triangle congruence postulates/criteria

Calculating angle measures to verify congruence

Determining congruent triangles

Proving triangle congruence

Corresponding parts of congruent triangles are congruent

Angles in a triangle sum to 180° proof

Proofs concerning equilateral triangles

Proofs concerning isosceles triangles

Triangle exterior angle example

Isosceles & equilateral triangles problems

Corresponding angles in congruent triangles

Finding angles in isosceles triangles

Finding angles in isosceles triangles (example 2)

Proof: Opposite sides of a parallelogram

Proof: Diagonals of a parallelogram

Proof: The diagonals of a kite are perpendicular

Proof: Opposite angles of a parallelogram

Proof: Rhombus diagonals are perpendicular bisectors

Proof: Rhombus area

Geometry proof problem: congruent segments

Geometry proof problem: squared circle

Geometry proof problem: midpoint

Geometric constructions: congruent angles

Geometric constructions: perpendicular bisector

Geometric constructions: parallel line

Geometric constructions: perpendicular line through a point on the line

Geometric constructions: perpendicular line through a point not on the line

Geometric constructions: angle bisector