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

Rolling an Equilateral Triangle
Angle Addition: Warm Up Exercises
גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
bewijs stelling van Pythagoras
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教材を発見

Pythagoras' Theorem
PMC 2008-09 Q2
Amanda_Jessup_Qtr1Project
Puzzles and games and fun stuff

トピックを見つける

有理数
二次曲線
方程式
微積分
曲面