如图(1)所示,用两块宽分别为
和1cm的矩形钢板(
,
),剪裁后在平面内焊成60°的“角型”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/c8e2dd1d-b592-4a2d-8b08-a1d14b792edc.png?resizew=373)
(1)设
,请问下料时
应取多少度?
(2)如图(2)所示,在以
为圆心,
为半径的扇形钢板区域内雕刻一矩形铭牌
,其中
在扇形的弧
上,求矩形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50eb6912feebf2b72c1ed993a79ef96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ae909caa014a76db06190700183508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b75f71a396f2910be554b1c71f51a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/c8e2dd1d-b592-4a2d-8b08-a1d14b792edc.png?resizew=373)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc4eff53a75a14a675562e8e3bfc13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)如图(2)所示,在以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49d869110f27140f5c1934143db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
更新时间:2021-03-22 22:54:13
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名校
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