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]

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Perimeter of a Rectangle with Unknown Sides
apec
ANGLE
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Ninth grade
Rectangular Pyramid Net
condScript
Alternate Angles
circles
Rectangle Characteristics

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Distribución geométrica
Cuadriláteros en general
Funciones
Semejanza
Problemas de Optimización