共圓點 | Concyclic Points

影片內容:

00:05 – 共圓點的概念 | concepts of concyclic points
03:59 – 測試共圓點 | tests for concyclic points
07:02 – 反證法的概念 | concepts of proof by contradiction
11:32 – 例子 1 | example 1
12:45 – 例子 2 | example 2
16:12 – 例子 3 | example 3

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