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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Model 3
Parts of a Circle
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The algebra of lines with perpendicular gradients
Application example graph
bike sweet tangent from slope
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Differential Equation
General Quadrilateral
Triangles
Vectors 2D (Two-Dimensional)
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