解题方法
1 . 如图,一个湖的边界是圆心为O的圆.湖面上有桥
(
是圆O的直径),湖的一侧有一条直线型公路l,
,
,已知
.
,
(单位:千米),现规划在公路l上选两个点P,Q,分别修建两条直线型公路PB,QA.要求公路PB,QA不穿过圆O,则( )
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864474745135104/2866004892049408/STEM/a141fcab-2810-445c-b86e-0ec54f02bbed.png?resizew=210)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ae16cdf6ce02a4adae05b010d59f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a64bcb77f5f64e4af6930c249a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f68df2f1fe204734d84075c1307b64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c3ebde251c6c5dec1c85c8620c782e.png)
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864474745135104/2866004892049408/STEM/a141fcab-2810-445c-b86e-0ec54f02bbed.png?resizew=210)
A.![]() |
B.![]() |
C.当![]() ![]() |
D.当![]() ![]() |
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