内心相关定理

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You can either download the .ggb file alone or the complete webpage for students with tasks.

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• Offline Activity (.zip)

• GeoGebra Files

  1. 鸡爪定理（4个爪） (.ggb)
     
  2. 鸭爪定理（三个四点共圆，由直角推得） (.ggb)
     
  3. Applet 3 (.ggb)