已知
的内角
.
,
的对边分别为
,
,
,若
,
,则
面积的取值范围为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2022·安徽合肥·二模 查看更多[4]
安徽省合肥市2022届高三下学期第二次教学质量检测理科数学试题(已下线)查补易混易错点08 直线与圆、圆锥曲线-【查漏补缺】2022年高考数学(理)三轮冲刺过关(已下线)理科数学-2022年高考押题预测卷03(全国乙卷)(已下线)9.2 椭圆(精练)(提升版) - 1
更新时间:2022-04-13 22:41:23
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【知识点】 轨迹问题——椭圆
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解题方法
【推荐1】在圆
上任取一点
,过点
作
轴的垂线段
,
为垂足,则当点
在圆上运动时,可求得线段
的中点
的轨迹方程是椭圆
,相当于把圆
压缩后得到了椭圆
.现有一条不过原点的直线与椭圆
交于
、
两点,则
面积的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01268ac8e838d0f45ccb35bc1d479d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】“工艺折纸”是一种把纸张折成各种不同形状物品的艺术活动,在我国源远流长,某些折纸活动蕴含丰富的数学内容.例如,用一张圆形纸片,按如下步骤折纸(如图).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/9d0d4fa6-9e55-4d5c-9c9f-c36de2442645.png?resizew=119)
步骤1:设圆心是
,在圆内异于圆心处取一点,标记为
;
步骤2:把纸片折叠,使圆周正好经过点
;
步骤3:把纸片展开,并留下一道折痕;
步骤4:不停重复步骤2和步骤3,就能得到越来越多的折痕.圆面上所有这些折痕围成一条曲线,记为
.现有半径为
的圆形纸片,定点
到圆心
的距离为
,按上述方法折纸,在
上任取一点
,
为线段
的中点,则
的最小值为________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/9d0d4fa6-9e55-4d5c-9c9f-c36de2442645.png?resizew=119)
步骤1:设圆心是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
步骤2:把纸片折叠,使圆周正好经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
步骤3:把纸片展开,并留下一道折痕;
步骤4:不停重复步骤2和步骤3,就能得到越来越多的折痕.圆面上所有这些折痕围成一条曲线,记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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