Search
GeoGebra
  • Home
  • Resources
  • Profile
  • Classroom
  • App Downloads

Lesson 86. Properties of Parallel Lines

Author:Norm Prokup

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

  • Nikmati Keunggulan Di Bandar Judi Terpercaya
  • အခြေခံ data အခေါ်အဝေါ်များ
  • Classifying Triangles
  • רישום חופשי
  • apec

Discover Resources

  • Morgan_UnitCircle
  • Midpoint Quadrilateral
  • Moving in the Plane: IM 8.1.1
  • 파워볼검증사이트 이지파워볼 EasypowerbaLL. com 동행복권1등 먹튀검증사이트목록
  • Coordinates and Geometry
  • Theorem of Iccarah

Discover Topics

  • Means
  • Differential Equation
  • Terms
  • Bar Chart or Bar Graph
  • Calculus
AboutPartnersHelp Center
Terms of ServicePrivacyLicense
Graphing CalculatorCalculator SuiteMath Resources

Download our apps here:

Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917

© 2026 GeoGebra®