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]

New Resources

Constructing the Perpendicular Line Through a Point Not on the Line
Conchoids of Nicomedes
derivatives of power
power rule of x^n derivatives
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Discover Resources

Exploration2-3c
Two triples of cocurrent cevians
Gamut Scaling Final
M 7a WAG/HAI Dreieck im Gleichgewicht
Basic hyperbolic tools 1

Discover Topics

Correlation
Hyperbola
Vectors 2D (Two-Dimensional)
Similar Triangles
Reflection