如图是一个小圆同学设计的一个鱼缸截面图,弓形
是由优弧
与弦
组成,
是鱼缸的玻璃隔断,弓形
部分不注水,已知
,且圆心
在
上,
.注水时,当水面恰好经过圆心时,则水面宽
为________
;注水过程中,求水面宽度
的最大值为________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585296a648610e8e8b567b16f9dfa9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9179bee09452bbd0e5080501bb0ee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9179bee09452bbd0e5080501bb0ee9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/7f033fee-373c-4bf7-966d-052a6753cad6.png?resizew=169)
更新时间:2022-09-01 17:18:04
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【推荐1】如图,
,
,
的垂直平分线交
的延长线于点
,交
于点
,交
于点
.若
,
,
的平分线交
于点
,则
的长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】如图,矩形
边
上有一动点
,连接
,以
为边作矩形
,使边
过点
.若
,
,当
为等腰三角形时,
的长是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/65a3bb8f-8739-4929-814f-923a0e1be4f0.png?resizew=131)
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【推荐1】如图,在平行四边形
中,
,
.连接
,且
,
平分
交
与于点
.点
在
边上,
,若线段
(点P在点
的左侧)在线段
上运动,
,连
、
,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】如图,矩形纸片ABCD中,AB=8cm,AD=6cm,按下列步骤进行裁剪和拼图:
第一步:如图①,在线段AD上任意取一点E,沿EB,EC剪下一个三角形纸片EBC(余下部分不再使用);
第二步:如图②,沿三角形EBC的中位线GH将纸片剪成两部分,并在线段GH上任意取一点M,线段BC上任意取一点N,沿MN将梯形纸片GBCH剪成两部分;
第三步:如图③,将MN左侧纸片绕G点按顺时针旋转180º,使线段GB与GE重合,将MN右侧纸片绕H点按逆时针方向旋转180º,使线段HC与HE重合,拼成一个与三角形纸片EBC面积相等的四边形纸片(裁剪和拼图过程均无缝且不重叠)则拼成的这个四边形纸片的周长的最大值为___ cm.
第一步:如图①,在线段AD上任意取一点E,沿EB,EC剪下一个三角形纸片EBC(余下部分不再使用);
第二步:如图②,沿三角形EBC的中位线GH将纸片剪成两部分,并在线段GH上任意取一点M,线段BC上任意取一点N,沿MN将梯形纸片GBCH剪成两部分;
第三步:如图③,将MN左侧纸片绕G点按顺时针旋转180º,使线段GB与GE重合,将MN右侧纸片绕H点按逆时针方向旋转180º,使线段HC与HE重合,拼成一个与三角形纸片EBC面积相等的四边形纸片(裁剪和拼图过程均无缝且不重叠)则拼成的这个四边形纸片的周长的最大值为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/33b77de8-27f4-40c1-8d0c-2bbdb9aac294.png?resizew=444)
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解题方法
【推荐1】如图,正方形
中,点
是
边上一点,连接
,以
为对角线作正方形
,边
与正方形
的对角线
相交于点
,连接
,有以下五个结论:①
;②
;③
;④
;⑤若
,则
,你认为其中正确的是_______ (填写序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98af5bcdcd1f6b662e6e88224fc9d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5ddefbc64e748969a65062a782005d.png)
![](https://img.xkw.com/dksih/QBM/2022/7/5/3015926199238656/3054411649515520/STEM/8c79ba47adbd4c9fa3d953f91dbb8071.png?resizew=215)
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【推荐2】如图,在
中,
,点E在线段
上,在
延长线上取一点D,连接
,使得
,若
,则
的面积为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb58507923435d8218d9883c47bb6096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca61f08915e5bd5d9581cb90894e2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04be23ea63f561d0d422b892631d0487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/8aaccd63-d33f-48cc-ab46-3e54147a6313.png?resizew=165)
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