名校
1 . 如图,圆C:
与圆O:
内切于点A,当圆C沿圆O逆时针方向无滑动地滚动一周时,圆C上的定点P(开始在点A)运动的轨迹是一个三叶轮.已知圆C上的定点P按这种运动方式从点A开始运动(B是两圆的切点).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/fddcfe0b-943a-40b1-a8ab-159fe401e6ab.png?resizew=170)
(1)若
,求点P的坐标;
(2)若
,求点P的轨迹关于
的参数方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9df0d79e42d86b0def4caa10dffa75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08227ca941898eb34941f446ca8b1de8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/fddcfe0b-943a-40b1-a8ab-159fe401e6ab.png?resizew=170)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e00f8bacce4d649b535449f04568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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解题方法
2 . 如图,某小区有一空地,要规划设计成矩形
,
米,拟在
和
两个区域内各自内接一个正方形
和正方形
用作喷泉水池,并且这两个正方形恰好关于线段
的中点成中心对称,为了美观,矩形
区域除了喷泉水池其余都种植鲜花.设
表示矩形
的面积,
表示两个喷泉水池的面积之和,
,现将比值
称为“规划指数”,请解决以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/57cb090a-f2d4-4a7a-aa38-1254674ee807.png?resizew=229)
(1)试用
表示
和
;
(2)当
变化时,求“规划指数”取得最小值时角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d296e0d7154a170cb7d3ae42989b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417d8c68aac736fa56f7fc6f6c8a07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd32639c396d5d2a8cce9ca287438a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9358478342e5a17e282037ce644af29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/57cb090a-f2d4-4a7a-aa38-1254674ee807.png?resizew=229)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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