ClassFlow
Class Flow: Braun Chapter
[Free Registration/Login Required] This is a brief discussion between teacher and student using geometrical graphics to explore vocabulary. Vertical angles, linear angles, consecutive points, and collinear points are highlighted.
CK-12 Foundation
Ck 12: Geometry: Parallel and Perpendicular Lines
[Free Registration/Login may be required to access all resource tools.] Identifying types of lines as parallel lines, perpendicular lines or intersecting lines.
Math Open Reference
Math Open Reference: Vertical
Learn about vertical lines with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.