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构造论证：直线外一点的对称点（和在线上的投影点）

Topics in 构造论证：直线外一点的对称点（和在线上的投影点）

Numbered in the order to learn them.

  1. 三角形三条高的交点是垂心

  2. Special lines of triangles

  3. Review of parallels & transversals

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