1 . 2023年12月1日,“民族魂·中国梦——阳光下成长”2023年浙江省中小学生艺术节闭幕式暨颁奖晚会在湖州大剧院举行.为迎接艺术节闭幕式的到来,承办方计划将场地内一处扇形荒地进行改造.已知该扇形荒地
的半径为20米,圆心角
,承办方初步计划将其中的
(如下左图,点
位于弧
上,
,
分别位于半径
,
)区域改造为花卉区,扇形荒地
内其余区域改造为草坪区.
,
设计为观光步道,其宽度忽略不计.若观光步道造价为
元/米,请你设计观光步道的造价预算,确保观光步道最长时仍有资金保障;
(2)因某种原因,承办方修改了最初的改造计划,将花卉区设计为矩形
(如下右图,其中
,
位于半径
上,
位于半径
上).为美观起见,承办方最后决定将四边形
设计为正方形.求此时花卉区
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc790cfaa59a808c25a7edb95dc29fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efba1257f270da9c9f771560695ec1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1b8bd4a2d822a44598ca977ca7355a.png)
(2)因某种原因,承办方修改了最初的改造计划,将花卉区设计为矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5561f04eac30e162a1d9774526675af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5561f04eac30e162a1d9774526675af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5561f04eac30e162a1d9774526675af8.png)
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解题方法
2 . 如图所示,镇海中学甬江校区学生生活区(如矩形
所示),其中
为生活区入口.已知有三条路
,
,
,路
上有一个观赏塘
,其中
,路
上有一个风雨走廊的入口
,其中
.现要修建两条路
,
,修建
,
费用成本分别为
,
.设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/1fcb3149-cddf-462f-a228-8f68d1a3c831.png?resizew=179)
(1)当
,
时,求张角
的正切值;
(2)当
时,求当
取多少时,修建
,
的总费用最少,并求出此的总费用.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabfa1b05d1440a42469adf0d871b95c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6526f2b85a9ecb86068dd7690105fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef10ca4f07bbda64d78ee6f13158e279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef10ca4f07bbda64d78ee6f13158e279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb81a200cf22efca514ddc0c5b41e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee4166c963f7bf0c7a62f3e2a85d305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce5753e08314463418b9ff05a3d2523.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/1fcb3149-cddf-462f-a228-8f68d1a3c831.png?resizew=179)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c42b962b2435a1c451d74e128982188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5514bd4247767f0933213b3aa3a0c3bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f2232e660554ea1a736b90031a52ce.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68c918b092abeee116535242a05fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef10ca4f07bbda64d78ee6f13158e279.png)
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