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

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Untitled
רישום חופשי
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トピックを見つける

立方体
ランダムな実験
三角関数
長方形
相似三角形