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

Building Triangles with Set Areas
Rolling Circles and Polygons
Conway Circle Theorem
အခြေခံ data အခေါ်အဝေါ်များ
Building Parallelograms with Set Areas

Discover Resources

melukis sudut 60
Limits and convergence
Triangles Segments
Slopes of Perpendicular Lines

Discover Topics

Diagrams
Integers
Arithmetic Operations
Quadrilaterals
Pythagoras or Pythagorean Theorem