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--- a/数学课程/【2022山东中考】压轴题动点最值问题.md
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+![](http://dsideal.obs.cn-north-1.myhuaweicloud.com/HuangHai/BlogImages/2023/04/5265283b0c47a6aad5c85b0a0835994c.png)
+
+- $\triangle ABF \cong \triangle AED$
+- $\therefore \angle 2=\angle BAF$
+- $\because \angle 3+\angle FAB=90^{\circ}$
+- $\therefore \angle 2+\angle 3=90^{\circ}$
+- 画出外接隐藏圆，以$O$为圆心
+- 套路，满满的套路！找出一个三角形吧：$\triangle OGB$!,$BG>=OB-OG$!