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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Classifying Triangles
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Focus and Directrix
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The Geometry of 2x2 Matrix Multiplication
Example 3
Pequeño Dodecaedro y Gran Dodecaedro Estrellado 2.0

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