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]

Nuevos recursos

Fourier Lissajous (Mechanical)
Cartesian vs Polar
Angle Addition: Warm Up Exercises
Hyperbolic Paraboloid
Slope Between 2 Points (Phase 2)

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translation (4)
How does magnitude of cross product changes with angle ?
การลบจำนวนเต็ม
การบวกจำนวนเต็ม
Freshmen konzultáció: Cikloisok - Cycloids

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Secciones Cónicas
Porcentajes
Segmento
Coordenadas
Función Tangente