Geometry section of

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Angles and Parallel Lines (alternate interior/exterior, corresponding, interior same side)
Perpendicular Lines (perpendiculars and related theorems)
Perpendicular Bisectors (discussion and theorem proofs)
For "Equations" of Parallel and Perpendicular Lines see Equations Section.


REFRESHERS: (while these topics are mostly "review", you may also find new information here)
Definitions of Parallel and Perpendicular Lines (parallel, transversal, perpendicular)