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Lesson 86. Properties of Parallel Lines
Auteur :
Norm Prokup
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]
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Prism Drawn in 1-Point Perspective
Triangle with 3 Right Angles
Pitfalls of Disk/Washer Method
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