Lesson 86. Properties of Parallel Lines

T6-criterion for parallel lines

[bgcolor=orange] If two lines are intersected by a third line, and alternate interior (or exterior) angles are equal, then the original two lines are parallel. [/bgcolor]

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Circle Passing Through 3 Points
Reflection Across 2 Parallel Lines
Locus Related to Descartes' Folium
Untitled

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probability calculator (with dynamic x axis)2
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