已知：ABCD是一任意四邊形
求作：AB 上一點 P，使 ∠ADP=∠BCP
作圖：
1. 以A為圓心，AD為半徑畫一圓
2. 以B為圓心，BD為半徑畫一圓
3. 兩圓相交於點E
4. 延伸BC及EA，使BC及EA相交於F
5. 作△ECF的外接圓
6. 外接圓跟AB交於一點P，便是所求
- Target Group (Age)
- 15 – 18
- Language
- Chinese Traditional / 繁體中文
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