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

Classifying Triangles
အခြေခံ data အခေါ်အဝေါ်များ
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Trammel of Archimedes Art
Regular Polygons and Equivalent Triangles

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SOH
Vertical Angles Exploration (2)
Copia de Copia de Copia de Graphing Linear Equations in 2 Unknowns
THE SPACE-TIME UNIT CIRCLE

Discover Topics

Scalene Triangles
Solids or 3D Shapes
Exponential Functions
Linear Functions
Straight Lines