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

Slope and Road Signs
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Trefoil Knot
Fourier Lissajous (Mechanical)

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נוסחת שטח משולש
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Blast-Off
ANGLE SUM PROPERTY OF TRIANGLE

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Límites
Integral Indefinida
Semejanza
Curvas paramétricas
Sustracción