What is a linear transformation?
Topics in What is a linear transformation?
Numbered in the order to learn them.
Breaking Into Smaller Pieces
Approximating Arc Length Without Calculus
Similarity transformations preserve angle measures
Multiplying 2-D vectors by scalars
Sine area formula for triangle
Summary/more on the internal angle bisectors (cevian), incenter, and incircle
Importance of pairs of parallel lines
Triangle rules: SSS and HL similarity
Dropping perpendiculars