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9 lines
455 B
9 lines
455 B
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- $\because \angle BAP =\angle PBC$
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$\therefore \angle BAP+\angle ABP=90^{\circ}$
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- 隐藏圆出现！因为圆的直径对的圆周角就是直角！
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画出隐藏圆吧
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- 求$CP$的最小值，就是构建一个包含这条边的一个三角形，比如 $\triangle OPC$,则$CP>=OC-OP$
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- $OP$是定值，则$OC$最短即可 |