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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Solving 2x2 and 3x3 Systems Using Cramer's Rule
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Parametric surfaces: Sphere
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Lesson 5.2 - Bisectors in a Triangle
Exercise 14
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