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

Proving Triangles Similar: Multistep Transformations
Two Triangle Theorem
Line Through Two Points and Slope
How to Draw a Cube in 2D
Portions of a Sphere

Discover Resources

מציאת נקודת הפגישה של שני ישרים
circumcenter-tri
Rotated Conic Example 1
Сабирање углова

Discover Topics

Variance
Frequency Distribution
Derivative
Algebra
Arithmetic Operations