综合与实践
【问题情境】在
中,
,
,
,在直角三角板
中,
,将三角板的直角顶点
放在
斜边
的中点处,并将三角板绕点
旋转,三角板的两边
,
分别与边
,
交于点
,
.
【猜想证明】如图
,在三角板旋转过程中,当
为边
的中点时,试判断四边形
的形状,并说明理由.
【问题解决】如图
,在三角板旋转过程中,当
时,求线段
的长.
【问题情境】在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14af6bf74442941c372bb708bcdcb5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
【猜想证明】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a6fa5218491da01843cdfde0c3dcbd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/88026fe1-5aac-4b3d-a743-b4d7e3a9495a.png?resizew=180)
【问题解决】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8b7bf73ae89cefd7e01342b4d49afe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/6ba9b1ed-2ff5-41e6-b8cf-627e89b5bb0f.png?resizew=178)
更新时间:2023-06-19 14:50:35
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】(1)如图1,
中,D为
边上一点,将点A沿经过点D的直线翻折,使得A的对应点
恰好落在
边上,请用无刻度的直尺和圆规作出点
;(不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718671629008896/2721697671626752/STEM/2e01f463-47c7-4786-8bef-aa2ff70c5c84.png)
(2)D为线段
中点.
①如图2,点P在线段
上,
沿直线
翻折后得到的
,请用无刻度的直尺和圆规作出点P;(不写作法,保留作图痕迹)
②如图3,
,点P在射线
上,
沿直线
翻折后得到的
,若
,则线段
的长度为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718671629008896/2721697671626752/STEM/2e01f463-47c7-4786-8bef-aa2ff70c5c84.png)
(2)D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①如图2,点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0fa75333a347f013c2949975861e8af.png)
②如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0fa75333a347f013c2949975861e8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb9aeb8992010af0a9770d196593542.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】已知
在平面直角坐标系
内,顶点坐标分别为
,
,
,正方形网格中每个小正方形的边长是一个单位长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/3715ad30-41d2-4862-9bbc-8be66c372d80.png?resizew=241)
(1)画出
向下平移
个单位长度后得到的
;
(2)画出
绕点
顺时针旋转
后得到的
,并写出点
的坐标;
(3)求在(2)中变换过程中,点
绕点
旋转到
点所经过的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965b8a53a7c167c5e490bb6d4504e88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01e555bf9cbc0a88f92dbf05166add2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/3715ad30-41d2-4862-9bbc-8be66c372d80.png?resizew=241)
(1)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08067cdc969670ee42bfc88e9d0d5257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
(3)求在(2)中变换过程中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,D,E分别是
,
的中点,
,
.
是菱形;
(2)连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/daee8baa62b5b8d5db41eab0d360ee51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672e7654527d91a25c0e6ea654364e2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图所示,在四边形
中,
,
、
分别是
、
的中点,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579973374697472/2580763029069824/STEM/d858894606fd47f4b31e37bf58882156.png?resizew=193)
(1)求证:四边形
是菱形;
(2)若
,且
、
延长后相交所成的锐角是
,求四边形
的面积______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579973374697472/2580763029069824/STEM/d858894606fd47f4b31e37bf58882156.png?resizew=193)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知:如图,在ABCD 中,对角线 AC、BD 相交于点 O,点 G、H 分别是 AD、BC 的中点, 点 E、O、F 分别是对角线 BD 上的四等分点,顺次连接 G、E、H、F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/3d4d4192-1c7a-4f3c-86fe-8f2417adb749.png?resizew=212)
(1)求证:四边形 GEHF 是平行四边形;
(2)当 AB与 BD满足条件_________时,四边形 GEHF 是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/3d4d4192-1c7a-4f3c-86fe-8f2417adb749.png?resizew=212)
(1)求证:四边形 GEHF 是平行四边形;
(2)当 AB与 BD满足条件_________时,四边形 GEHF 是矩形.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图1,已知
,
,
,E为
的中点.
为矩形;
(2)如图2,F为
边上一点,
.
①若F为
的中点,求证:
;
②若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabd660ff9eed83c543bd61750388f08.png)
①若F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c4e9b0541289bf95c8a7aac4357233.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4982bdbeb295651557a71800f567444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】材料:如图①,
和
是
的两条弦(即折线
是圆的一条折弦),
点
是弧
的中点,则从点
向
所作垂线的垂足
是折弦
的中点,即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/ac626c26-701f-4deb-9795-5308bd837a14.png?resizew=156)
(1)如图②,已知等边
内接于
为弧
上--点,
于点
,求
的周长
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6be63f06-abe9-4e01-b9f7-8ba542d3c696.png?resizew=155)
(2)求证:
.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f0b386ea2c62611b9633f55bf99a16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/ac626c26-701f-4deb-9795-5308bd837a14.png?resizew=156)
(1)如图②,已知等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318cd5423062598e8ff34e39a469f0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1c2e1c1187fb651edc4ae000227ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1fc2305fd371a1ff1f91cd834140e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6be63f06-abe9-4e01-b9f7-8ba542d3c696.png?resizew=155)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/bfaf841e-1e47-4b87-b08e-e5bca140e002.png?resizew=156)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,正三角形的边长为6cm,剪去三个角后成一个正六边形.
![](https://img.xkw.com/dksih/QBM/2019/10/8/2307507439927296/2307582879072256/STEM/f9b4ad60eea6493e85c187dedef5cf25.png?resizew=119)
(1)求这个正六边形的边长.
(2)求这个正六边形的边心距.
(3)设这个正六边形的中心为O,一边为AB,则AB绕点O旋转一周所得的图形是怎样的?(作图表示出来)并求出这条线段AB划过的面积.
![](https://img.xkw.com/dksih/QBM/2019/10/8/2307507439927296/2307582879072256/STEM/f9b4ad60eea6493e85c187dedef5cf25.png?resizew=119)
(1)求这个正六边形的边长.
(2)求这个正六边形的边心距.
(3)设这个正六边形的中心为O,一边为AB,则AB绕点O旋转一周所得的图形是怎样的?(作图表示出来)并求出这条线段AB划过的面积.
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解答题-问答题
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【推荐3】如图①,在△ABC中,CD⊥AB于点D,AD=CD=2,BD=4,点E是线段BD的中点,点P从点A出发,沿折线AC﹣CB向终点B运动,点P在边AC上的速度为每秒
个单位长度,点P在边BC上的速度为每秒
个单位长度,设点P的运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/2021/3/17/2680022235611136/2682678753910784/STEM/8fb71e0176b84fada4efc59c9d85a562.png?resizew=347)
(1)PC= (用含t的代数式表示);
(2)求出点P到直线AB的距离(用含t的代数式表示);
(3)当点P在边BC上时,在△BCD的边上(不包括顶点)存在点H,使四边形DEPH为轴对称图形,直接写出此时线段CP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2021/3/17/2680022235611136/2682678753910784/STEM/8fb71e0176b84fada4efc59c9d85a562.png?resizew=347)
(1)PC= (用含t的代数式表示);
(2)求出点P到直线AB的距离(用含t的代数式表示);
(3)当点P在边BC上时,在△BCD的边上(不包括顶点)存在点H,使四边形DEPH为轴对称图形,直接写出此时线段CP的长.
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