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

繪畫垂直線
Pythagorean Template: Integer Legs
Congruent Sides & Angles in △s: Exploration
Writing and Graphing Proportional Relationships (k>0)
Function art 3D - waiting shed

Discover Resources

Dollars for Dancing Haley Graph
Sets Relations Groups
math
GeoGebra Exploration
Verksted sinus- cos- og arealsetning

Discover Topics

Quadrilaterals
Curve Sketching
Intersection
Square
Correlation