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

apec
Rectangle Construction Template (V2)
Classifying Triangles
Trammel of Archimedes Art
גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם

Discover Resources

Rotations
TriangleEquilateralDansCarrebis
e^x and Taylor Polynomials
Derivative of Log Functions
Touching pentagons
Unit Circle Exploration

Discover Topics

Pythagoras or Pythagorean Theorem
Natural Numbers
Diagrams
Probability
Addition