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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Slope Between 2 Points (Phase 2)
Building Trapezoids with Set Areas
Area of a Circle Illustrated
Rectangle Construction Template (V2)
Regular Polygons and Equivalent Triangles

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First Principles (revised)
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Prisme

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