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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Domain of f(x,y)
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Fractal Tétraèdre. Dilatation -1/2 centre triangles
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Parallelograms 2
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Transformation Quiz
Angle between Lateral Faces of Rectangular Pyramid
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