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共同的角平分线

Topics in 共同的角平分线

Numbered in the order to learn them.

  1. 回顾：全等变换保持距离不变

  2. 垂线（顶垂线）

  3. 什么是几何中的点？

  4. 回顾：角平分线性质

  5. 函数的类型

  6. Review of circumference, arcs & pi

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