在
中,
,点D是边
上一动点,点E是直线
上的点,且
.
,
,且
,求线段
的长;
(2)如图2,若
,
的延长线交
的延长线于点F,求证:
;
(3)如图3,若
,且
,过点C作
交
的延长线于点M,连接
,点N为线段
的中点,连接
,
,当
最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e7c8586eef5596aef5fb5160a196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928cb42b14030299baee4481b09e8a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df46ad76c129a1eccdea3553e0b7423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/563fc0e0b9ef2136d6d994a9f186adda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635e59c002000da2fa1709b9b979d11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2267ad3147b9255936767360c36b2295.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c287bb15494297df234f700f9f3a90d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc9f0779b0ba2f9f97caf35c166ad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108a74d1a3f66ffc2abd9b805657434b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a3f913906d27cd5ca71e67ab00a6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e1217b02b470ee0d270d3b8d744a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625840effafe71ceadeb11088dca4ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2bd387ad688461e522af5acf2108d5.png)
更新时间:2023-01-26 14:56:00
|
相似题推荐
解答题-证明题
|
困难
(0.15)
【推荐1】已知,四边形
是正方形,
绕点D旋转(
),
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/98f5353f-bcf9-496e-b4a7-a295ef1fe5f7.png?resizew=461)
(1)如图1,求证:
;
(2)直线
与
相交于点G.
①如图2,
于点M,
于点N,在
旋转的过程中,
的大小是否发生变化,请说明理由.
②如图3,连接BG,若
,
,直接写出在
旋转的过程中,线段
长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d809b67606b7ecae68b13cd743a963a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b1efb5d9072a67be9d5497a783016c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/98f5353f-bcf9-496e-b4a7-a295ef1fe5f7.png?resizew=461)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f501137809dba21dfab7dd56f68f7.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88583f8fb68d7158bedb4510279a0fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68bfc2d2fde52ed5f65824c182211109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
②如图3,连接BG,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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解答题-问答题
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【推荐2】问题提出:
(1)如图1,已知Rt△ACB和Rt△ADB,∠ACB=90°,∠ADB=90°,其中CA=CB,∠DAB=30°,AB=4
,求△ACB和△ADB的面积分别是多少?
问题探究:
滨河学校初二年级小张是一名特别爱好专研数学的学生,他在数学老师的帮助下发现:对于任意三角形,其中一个内角和其对边都为定值时,当另两边相等时,该三角形面积达到最大.例如,如图2,在△ABC中,已知三角形内角B和其对边AC都为定值,当BA=BC时,△ACB的面积达到最大.请利用小张同学的发现完成以下问题.
(2)如图3,在△ACB中,∠BAC=120°,点D为BC的中点,AD=4,当△ABD面积最大时,求线段AB的值.
问题解决:
(3)如图4,已知等边△ACB,∠ADB=30°,CD=4,求四边形ADBC的面积的最小值.
(1)如图1,已知Rt△ACB和Rt△ADB,∠ACB=90°,∠ADB=90°,其中CA=CB,∠DAB=30°,AB=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
问题探究:
滨河学校初二年级小张是一名特别爱好专研数学的学生,他在数学老师的帮助下发现:对于任意三角形,其中一个内角和其对边都为定值时,当另两边相等时,该三角形面积达到最大.例如,如图2,在△ABC中,已知三角形内角B和其对边AC都为定值,当BA=BC时,△ACB的面积达到最大.请利用小张同学的发现完成以下问题.
(2)如图3,在△ACB中,∠BAC=120°,点D为BC的中点,AD=4,当△ABD面积最大时,求线段AB的值.
问题解决:
(3)如图4,已知等边△ACB,∠ADB=30°,CD=4,求四边形ADBC的面积的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/83f93ab6-9320-4399-b674-24037fee2829.png?resizew=456)
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【推荐1】如图1,△ABC内接于⊙O,直径AD交BC于点E,延长AD至点F,使DF=2OD,连接FC并延长交过点A的切线于点G,且满足AG∥BC,连接OC,若cos∠BAC=
,BC=8.
(1)求证:CF是⊙O的切线;
(2)求⊙O的半径OC;
(3)如图2,⊙O的弦AH经过半径OC的中点F,连结BH交弦CD于点M,连结FM,试求出FM的长和△AOF的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)求证:CF是⊙O的切线;
(2)求⊙O的半径OC;
(3)如图2,⊙O的弦AH经过半径OC的中点F,连结BH交弦CD于点M,连结FM,试求出FM的长和△AOF的面积.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2454148362756096/2454859226161152/STEM/ab2f190c-0210-4ada-815b-c829efee37c4.png)
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解答题-证明题
|
困难
(0.15)
名校
【推荐2】【课本再现】
(1)如图1,正方形
的对角线相交于点O,点O又是正方形
的一个顶点,而且这两个正方形的边长都为1,四边形
为两个正方形重叠部分,正方形
可绕点O转动,则下列结论正确的是_______(填序号即可).①
;②
;③四边形
的面积总等于
;④连接
,总有
.
【类比迁移】
(2)如图2,矩形
的中心O是矩形
的一个顶点,
与边
相交于点E,
与边
相交于点F,连接
,矩形
可绕着点O旋转,猜想
之间的数量关系,并进行证明;
【拓展应用】
(3)如图3,在
中,
,直角
的顶点D在边
的中点处,它的两条边
和
分别与直线
相交于点E,F,
可绕着点D旋转,当
时,求线段
的长度.
(1)如图1,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0463da43878c8c9848d921ecf77f1ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0f79142caacc4d08942ffa23511f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0463da43878c8c9848d921ecf77f1ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e80a8bd94cda556ea7444f187a670a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/26/453b74f5-76ea-4a22-8f0d-7937a161bdaa.png?resizew=594)
【类比迁移】
(2)如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc526324e78e4d9226d1b537f27845a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db1d48817b63eba957ac50fe259af0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e045bc50398f2a1196c67a83a1b00b5.png)
【拓展应用】
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d82675b28bf04a069c442ca4f0c18b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4f3ab11a8b54cf29685b1f750cb130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐1】在
ABC中,AB=7,∠A=45°,sinB=
,P为线段AB上一动点,设AP=x,过P作AB垂线交射线AC于点Q,将
APQ绕PQ中点旋转180°得到
DQP.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/9b9f08cf-3498-4ea6-8981-356637fd50cc.png?resizew=186)
(1)点C到AB的距离为 ;
(2)求出点D在
ABC内部时x的取值范围.
(3)当D点在
ABC外部时,边PD与边BC交点为E,当图形中存在全等三角形时(除
APQ与
DQP全等外),求BE的长.
(4)点F为BC中点,作点B关于PD的对称点
,连结
,当
与
ABC的边平行时,直接写出x值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/9b9f08cf-3498-4ea6-8981-356637fd50cc.png?resizew=186)
(1)点C到AB的距离为 ;
(2)求出点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)当D点在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(4)点F为BC中点,作点B关于PD的对称点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5d54dfb9237412a7c1c00658830de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6fb1802b376e44a9ff8482f5a650c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6fb1802b376e44a9ff8482f5a650c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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【推荐2】在菱形ABCD中,AB=10,∠A=60°,P是射线AD上一点,连接BP,将△ABP沿BP折叠,得到△A′BP.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/62a7aa75-93c9-4233-8d7b-11853f4b5896.png?resizew=601)
(1)如图,当点A′在AD左侧,且∠DPA′=10时,求∠PBA的度数;
(2)当PA′⊥BC时,求线段AP的长;
(3)连接A′C,当A′C=2
时,求线段AP的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/62a7aa75-93c9-4233-8d7b-11853f4b5896.png?resizew=601)
(1)如图,当点A′在AD左侧,且∠DPA′=10时,求∠PBA的度数;
(2)当PA′⊥BC时,求线段AP的长;
(3)连接A′C,当A′C=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
您最近一年使用:0次
解答题-问答题
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名校
【推荐3】【问题提出】
(1)如图1,在矩形
中,
,
,点E为
的中点,点P为矩形
内以
为直径的半圆上一点,则
的最小值为______;
【问题探究】
(2)如图2,在
中,
为
边上的高,且
,P为
内一点,当
时,求
的最小值;
【问题解决】
(3)如图3,滨河学校餐厅门口有一块“疯狂四季”四边形菜园
,
,
与
相交于点P,且
,过点A作直线
的垂线交直线
于点E,即
,
米.赵老师准备在
内种植当季蔬菜,边BE的中点F为菜园出入口,为了种植方便,她打算在
边上取点M,并沿
、
修两条人行走道,要求人行走道的总长度尽可能小,问
的长度是否存在最小值?若存在,求出其最小值;若不存在,请说明理由.
(1)如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/fc5adb5eb60ae4435a12d93854066298.png)
【问题探究】
(2)如图2,在
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf91a833f6977fbefc242f8a8bbeef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f998ca5d4f249d7a703cb5e1339918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d1d99eab930cef884e01b97d4d56f1.png)
【问题解决】
(3)如图3,滨河学校餐厅门口有一块“疯狂四季”四边形菜园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc2ada75df71c96fa3c6e4845a22726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d5dd999aea55c7cab4641815fa53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05536e7eddf41fa151624ff5244abc56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b6e6c4d71182e71b289e3e65ddcb06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/37f20e7d-02a2-411e-91d9-8f9c96654620.png?resizew=463)
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