题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034450-33687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034450-62937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034450-99583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034450-24513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034451-85015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034451-49878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034451-57123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034451-80245.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034452-90288.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034452-53807.png)
∵菱形ABCD中,AB=BC,
又∵AC=AB,
∴AB=BC=AC,即△ABC是等边三角形.
∴∠BAC=60°,
∴ 弧BC 的长是:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034452-12131.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034443-22799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034444-42151.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034444-20199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034444-44257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034445-62568.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034445-44102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034440-16707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034440-56374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034441-51858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034440-16707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034440-56374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034428-96966.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034429-24741.png)
(1)求水面宽度
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034428-30275.png)
(2)当水面上升到
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034429-92850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034429-78140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034428-96966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034429-88468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034430-83248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034424-74938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034424-35812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034424-27470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034424-93234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034424-89177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034425-18187.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034417-49757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034417-49757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034417-97091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034417-40668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105034417-73488.png)
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