intersection   2 videos

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  Vertical Angles

  Geometry Reasoning, Diagonals, Angles and Parallel Lines

  How to define and identify vertical angles.

  vertex intersecting lines congruent
• 

  Point of Concurrency

  Geometry Constructions

  How to define point of concurrency; how to identify the four main points of concurrency in triangles.

  intersection incenter angle bisectors circumcenter perpendicular bisector orthocenter altitude centroid median