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

Random Polar Curve (3)
Hyperbolic Paraboloid
Viviani's Curve
Slope and Road Signs
Angle Addition: Warm Up Exercises

Discover Resources

barycentre_2points
Draw image over the line of symmetry
Richard's G period Midsegment
cat on a ladder
(HoΡ) 1N
Roman Numerals

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Random Variables
Secant Line or Secant
Differential Equation
Statistical Characteristics
Set Theory