在
中,
.用尺规作图完成如下操作,保留作图痕迹.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/0fbc1a90-09a7-4542-a8cd-b01602c7e0a3.png?resizew=83)
(1)作
的角平分线
交
边于点D;
(2)在
上求作一点P,使得
;
(3)线段
之间的数量关系________.
(4)若
的度数是_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/0fbc1a90-09a7-4542-a8cd-b01602c7e0a3.png?resizew=83)
(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e5641c2b9c38884498a4e85778c012.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f279ddc3af0162ce0f87489cb226f8b1.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2aebc20c61d0127ed37e62a32f31b9d.png)
更新时间:2024-04-07 18:06:35
|
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解答题-作图题
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适中
(0.65)
名校
【推荐1】如图,在△ABC中,AB=AC,∠BAC=36°,请用尺规过点B作一条直线,使其将△ABC分成两个等腰三角形(保留作图痕迹,不写作法).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/0999034b-a645-42a0-abc0-156b17870bc4.png?resizew=158)
您最近一年使用:0次
解答题-作图题
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【推荐2】如图,四边形区域是青岛音乐广场的一部分,现在要在这一区域内建一个喷泉,要求喷泉到两条道路
,
的距离相等,且到入口
、
的距离相等请确定喷泉的位置
.
结论:______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/efd2492c-948d-4c49-9fa7-17aa28069708.png?resizew=186)
结论:
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解答题-问答题
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适中
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名校
【推荐1】【阅读材料】
【解答问题】
请你判断小明的作法是否正确,并说明理由.
老师的问题: 已知:如图,直线 ![]() ![]() ![]() ![]() 求作:菱形 ![]() ![]() ![]() ![]() ![]() ![]()
| 小明的作法: (1)分别以A和 ![]() ![]() ![]() ![]() (2)作直线 ![]() ![]() ![]() ![]() ![]() (3)连接 ![]() ![]() 四边形 ![]()
|
请你判断小明的作法是否正确,并说明理由.
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
是高,
是中线,
垂直平分
,连接
.
![](https://img.xkw.com/dksih/QBM/2024/2/29/3443455187828736/3443741561790464/STEM/1b2a90a008ba4136925115a422c0439e.png?resizew=139)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2024/2/29/3443455187828736/3443741561790464/STEM/1b2a90a008ba4136925115a422c0439e.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a668fcb9a29eebda06220828d3b0877d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513e1f8233611086ab6721a3a00e204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】综合与实践:动手操作:某校八(1)班数学课外兴趣小组在学完第13章的特殊三角形后,利用手头上的一副三角板,他们将一块直角三角板
(
,
)的直角顶点
放置在另一块直角三角板
(
,
)斜边
的中点处,并将三角板
绕点
任意旋转.
发现结论:
(1)如图,三角板
的两边
分别与另一块三角板的边
交于点
(规定:此时点
均在边
上运动),他们在旋转过程中,发现线段
与
的长总相等及四边形
的面积不会发生变化.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/7988597c-950c-41bb-b7ee-4b1e8f9306ca.png?resizew=188)
问题解决:
①请你帮他们说明
的理由;
②若
,请你帮他们求出四边形
的面积.
拓展延申:
(2)如图,连接
,当
,
时,那么直角三角板
在绕点
旋转一周的过程中,请你直接写出线段
长的最小值和最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6791aee96ff1579101462985839ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5b3967aa677f18e92912d2397f4907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
发现结论:
(1)如图,三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda573d13d7cc0fb63ec05d41faef03b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817610b69f5f7d96bdfc834d1dd699cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817610b69f5f7d96bdfc834d1dd699cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/7988597c-950c-41bb-b7ee-4b1e8f9306ca.png?resizew=188)
问题解决:
①请你帮他们说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51dfab0c1ec275ff83d08c7293968c4.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
拓展延申:
(2)如图,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba027570795fdca25194fde38be3d29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/0ad255f4-3422-4455-b488-2bc88dc2c162.png?resizew=188)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,在
中,
,点
为
的中点,直线
垂直平分
,点
为线段
上一动点,若
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面积为21,求
周长的最小值.
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