Linear Relationships
Pre-Alg · Unit 11
Parallel & Perpendicular Lines
Slope relationships
Curriculum standard — Understand stage of the Thinking Ladder
Concept first
Parallel & Perpendicular Lines begins with meaning — what it is and why it holds — before any procedure. The structure comes first; computation follows.
Definition
Parallel & Perpendicular Lines
The precise meaning of this topic, stated in mathematical terms.
A plain-language restatement so the definition is understood, not just memorized.
Three pathways, one topic