名校
解题方法
1 . 如图,某广场内有一半径为
米的圆形区域,圆心为
,其内接矩形
的内部区域为居民的健身活动场所,已知
米,为扩大居民的健身活动场所,打算对该圆形区域内部进行改造,方案如下:过圆心
作直径
,使得
,在劣弧
上取一点
,过点
作圆
的内接矩形
,使
,把这两个矩形所包括的内部区域均作为居民的健身活动场所,其余部分进行绿化,设
.
(单位:平方米),求
的表达式(不需要注明
的范围)______ .
(2)当
取最大值时,求
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5829dce032a4d687288f9e8f9c794c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc7c9678a30727f17e443a5f0d64daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7605ce6f221ce8cad191da0f84a216d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e66df4267cdf365dd2fe5b0011464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67edf82688d6d466c073e6706329e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f6e9947348b989ed20afa2de0a4c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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