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math-talks/eulers-line-and-nine-point-circle.md

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@@ -198,7 +198,7 @@ $$\vec{OG} = \frac{1}{3}\vec{OH}$$
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即 $G$ 在 $OH$ 上,且 $OG:GH = 1:2$,或 $HG = 2 \cdot OG$。**Q.E.D.**
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## 九点圆(25--40分钟)
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## 九点圆
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### 九点圆的定义
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@@ -312,7 +312,7 @@ $$r = \frac{M_{c}Z}{2} = \frac{OC}{2} = \frac{R}{2}$$
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**Q.E.D.**
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## 九点圆圆心在欧拉线上(40--50分钟)
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## 九点圆圆心在欧拉线上
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### 定理陈述
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