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扩展：有向角和长度

Topics in 扩展：有向角和长度

Numbered in the order to learn them.

  1. 证明技巧：规避举例法的有向长度和有向段

  2. 塞瓦和梅涅劳斯用的有向段

  3. 证明技巧：替代举例法的有向角

  4. 使用有向角的圆内接四边形

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