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

Trefoil Knot
Hyperbolic Paraboloid
Damped Trochoidal Curve
¿Quién llegará más lejos en el mundial?
apec

Discover Resources

Sin Cos Tan model
Untitled
Loci Triangle area
Deriving the sine graph from the unit circle
Mikus.Euler.ggb

Discover Topics

Step Functions
Natural Numbers
Special Points
LCM and GCD
Definite Integral