題三：拖拉紅點及綠點，作出一個紅色的rA'B'C'滿足

A'B' = AB，ÐA' = ÐA，A'C' = AC。

比較 rABC 與 rA'B'C'。你是否能夠作出一個不全等於 rABC 的 rA'B'C'？

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