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]

新しい教材

Function art 3D - waiting shed (v2)
What Do You See? (2)
What Do You See?
Slope Illustrator (2)
Congruent Figures

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Trigonometry: SAS
Lines from 2 points
Untitled
Geo Test
RETROGRADE MOTION OF MARS

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四角形
双曲線
微積分
複素数
自然数