pingguo9
种子
共回答了17个问题采纳率:88.2% 举报
(
![](https://img.yulucn.com/upload/2/fb/2fbd0d5b0fca1021b5eb3a21210a142e_thumb.jpg)
+1,
![](https://img.yulucn.com/upload/2/fb/2fbd0d5b0fca1021b5eb3a21210a142e_thumb.jpg)
+1)
∵OB=2,OA="2"
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
,
∴AB=
![](https://img.yulucn.com/upload/6/a2/6a2ac4f89825598c9e30a5fa47f8fa51_thumb.jpg)
=4,
∵∠AOP=45°,
P点横纵坐标相等,可设为a.Ⅲ
∵∠AOB=90°,
∴AB是直径,
∴Rt△AOB外接圆的圆心为AB中点,坐标C(
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
,1),
P点在圆上,P点到圆心的距离为圆的半径2.
过点C作CF∥OA,过点P作PE⊥OA于E交CF于F,
∴∠CFP=90°,
∴PF=a﹣1,CF=a﹣
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
,PC=2,
∴(a﹣
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
)
2 +(a﹣1)
2 =2
2 ,舍去不合适的根,
可得a=1+
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
,P(1+
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
,1+
![](https://img.yulucn.com/upload/e/cd/ecd85e4e31d33e5516d995fa4271eef6_thumb.jpg)
);
即P点坐标为(
![](https://img.yulucn.com/upload/2/fb/2fbd0d5b0fca1021b5eb3a21210a142e_thumb.jpg)
+1,
![](https://img.yulucn.com/upload/2/fb/2fbd0d5b0fca1021b5eb3a21210a142e_thumb.jpg)
+1).
1年前
8