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 by Dilation
Two Triangle Theorem
Folding door
Identify Opposite, Adjacent, Hypotenuse
ANGLE

Discover Resources

Wings with x^2 function.
Square: Ms
Turquía (Samsun): área en el cuadrilátero.
Saddle Surfaces
Waves

Discover Topics

Exponent
Plane Figures or Shapes
Stochastic Process or Random Process
Division
Equations