如图,在梯形ABCD中,AD//BC,AB=CD=AD=5,
,点O是边BC上的动点,以OB为半径的
与射线BA和边BC分别交于点E和点M,联结AM,作∠CMN=∠BAM,射线MN与边AD、射线CD分别交于点F、N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/ab83de58-245e-4f10-bb38-750d56893c9c.png?resizew=493)
(1)当点E为边AB的中点时,求DF的长;
(2)分别联结AN、MD,当AN//MD时,求MN的长;
(3)将
绕着点M旋转180°得到
,如果以点N为圆心的
与
都内切,求
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264381eddf150479287e20be0007ef90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/ab83de58-245e-4f10-bb38-750d56893c9c.png?resizew=493)
(1)当点E为边AB的中点时,求DF的长;
(2)分别联结AN、MD,当AN//MD时,求MN的长;
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4d1fdfe7232822894c3dc9ce0407be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c22f4b5c09a56bd63d8378365fbdbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4d1fdfe7232822894c3dc9ce0407be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
2020·上海徐汇·二模 查看更多[2]
更新时间:2020-05-16 06:27:40
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相似题推荐
解答题-问答题
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真题
【推荐1】如图1,在等边△ABC中,点D是边AC的中点,点P是线段DC上的动点(点
P与点C不重合),连结BP. 将△ABP绕点P按顺时针方向旋转α角(0°<α<180°),得
到△A1B1P,连结AA1,射线AA1分别交射线PB、射线B1B于点E、F.
(1)如图1,当0°<α<60°时,在α角变化过程中,△BEF与△AEP始终存在 ▲ 关
系(填“相似”或“全等”),并说明理由;
(2)如图2,设∠ABP="β" . 当60°<α<180°时,在α角变化过程中,是否存在△BEF与△
AEP全等?若存在,求出α与β之间的数量关系;若不存在,请说明理由;
(3)如图3,当α=60°时,点E、F与点B重合. 已知AB=4,设DP=x,△A1BB1的面积为
S,求S关于x的函数关系式.
P与点C不重合),连结BP. 将△ABP绕点P按顺时针方向旋转α角(0°<α<180°),得
到△A1B1P,连结AA1,射线AA1分别交射线PB、射线B1B于点E、F.
(1)如图1,当0°<α<60°时,在α角变化过程中,△BEF与△AEP始终存在 ▲ 关
系(填“相似”或“全等”),并说明理由;
(2)如图2,设∠ABP="β" . 当60°<α<180°时,在α角变化过程中,是否存在△BEF与△
AEP全等?若存在,求出α与β之间的数量关系;若不存在,请说明理由;
(3)如图3,当α=60°时,点E、F与点B重合. 已知AB=4,设DP=x,△A1BB1的面积为
S,求S关于x的函数关系式.
![](https://img.xkw.com/dksih/QBM/2011/8/9/1573239034126336/1573239107510272/STEM/ed0714ce1cdb472c9d43040f3f86674c.png)
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【推荐2】如图1,抛物线y
的图象与x轴交于点A、B,与y轴交于点C,连接BC,过点A作AD
BC交抛物线的对称轴于点D.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923363656130560/2926312415281152/STEM/094dc3f0445741ee92962e965fe93bd7.png?resizew=298)
(1)求点D的坐标;
(2)如图2,点P是抛物线在第一象限内的一点,作PQ⊥BC于Q,当PQ的长度最大时,在线段BC上找一点M(不与点B、点C重合),使PM
BM的值最小,求点M的坐标及PM
BM的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa034b689804398481bf4f7aa8344f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923363656130560/2926312415281152/STEM/094dc3f0445741ee92962e965fe93bd7.png?resizew=298)
(1)求点D的坐标;
(2)如图2,点P是抛物线在第一象限内的一点,作PQ⊥BC于Q,当PQ的长度最大时,在线段BC上找一点M(不与点B、点C重合),使PM
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145708a2cca54ecebb6001805a3eac69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145708a2cca54ecebb6001805a3eac69.png)
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解题方法
【推荐1】如图,在
中,
,
,
,
是
的外接圆,
是
延长线上一点,且
,连接
,点
是射线
上的动点
(1)求证:
是
的切线;
(2)
的长度为多少时,
的度数最大,最大度数是多少?请说明理由;
(3)点
运动的过程中,
的值能否达到最小,若能,求出这个最小值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/c0698b95-3e82-43f4-a228-e0ae8501f540.png?resizew=269)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d1d99eab930cef884e01b97d4d56f1.png)
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【推荐2】问题发现:
(1)如图1,
内接于半径为4的
,若
,则
_______;
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394802730754048/2395859633815552/STEM/cda17f78d6e9493abe065e0d97ca2dc0.png?resizew=382)
问题探究:
(2)如图2,四边形
内接于半径为6的
,若
,求四边形
的面积最大值;
解决问题
(3)如图3,一块空地由三条直路(线段
、AB、
)和一条弧形道路
围成,点
是
道路上的一个地铁站口,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9b5aa6e00dabe7bddf1f2a570e0b8f.png)
千米,
千米,
,
的半径为1千米,市政府准备将这块空地规划为一个公园,主入口在点
处,另外三个入口分别在点
、
、
处,其中点
在
上,并在公园中修四条慢跑道,即图中的线段
、
、
、
,是否存在一种规划方案,使得四条慢跑道总长度(即四边形
的周长)最大?若存在,求其最大值;若不存在,说明理由.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394802730754048/2395859633815552/STEM/cda17f78d6e9493abe065e0d97ca2dc0.png?resizew=382)
问题探究:
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ba2098ed6b4137b08932524b72ba37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
解决问题
(3)如图3,一块空地由三条直路(线段
![](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/9d78abbad68bbbf12af10cd40ef4c353.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/7f9b5aa6e00dabe7bddf1f2a570e0b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90bae886c8ab958aa4c693bf8e0627d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4dcdc159b6558c112270ba07a08286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6b2dcfd1fe3e7de1f11a3f08810337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ae677e35bd19e7eabf36706f2dcfda.png)
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【推荐3】如图1,抛物线
的顶点为M,平行于x的直线与抛物线交于点A,B,若
为等腰直角三角形,则抛物线上A,B两点之间的部分与线段AB围成的图形称为该抛物线对应的“准碗形”,记为“准碗形AMB” .顶点M称为碗顶,线段AB称为碗宽,点M到线段AB的距离称为碗高.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896990125031424/2899959025156096/STEM/f7e2674c-1bd1-4ca8-a25a-7d05bd9006c8.png?resizew=375)
(1)抛物线
对应的碗宽为______;
(2)抛物线
对应的碗宽为______,抛物线
对应的碗高为______;
(3)已知抛物线
对应的碗高为3.
①求碗顶M的坐标;
②如图2,将“准碗形AMB” 绕点M顺时针旋转30°得到“准碗形
” .过点
作x轴的平行线交准碗形
于点C,点P是线段
上的动点,过点P作y轴的平行线交准碗形
于点Q.请直接写出线段PQ长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896990125031424/2899959025156096/STEM/f7e2674c-1bd1-4ca8-a25a-7d05bd9006c8.png?resizew=375)
(1)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
(2)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45848d377cad2507fe6846d0882005e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222c9b6fa02f4591055a242a53bb7bf.png)
(3)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754b8b4af08f82672f87796d3e42b341.png)
①求碗顶M的坐标;
②如图2,将“准碗形AMB” 绕点M顺时针旋转30°得到“准碗形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42621a2c8648632dbd3b0ce3a35eccc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42621a2c8648632dbd3b0ce3a35eccc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42621a2c8648632dbd3b0ce3a35eccc2.png)
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【推荐1】在梯形ABCD中,AD∥BC,AB⊥BC,AD=3,CD=5,cosC=
(如图).M是边BC上一个动点(不与点B、C重合),以点M为圆心,CM为半径作圆,⊙M与射线CD、射线MA分别相交于点E、F.
(1)设CE=
,求证:四边形AMCD是平行四边形;
(2)联结EM,设∠FMB=∠EMC,求CE的长;
(3)以点D为圆心,DA为半径作圆,⊙D与⊙M的公共弦恰好经过梯形的一个顶点,求此时⊙M的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
(1)设CE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a85a2c984df17f7ef91d014d931410d.png)
(2)联结EM,设∠FMB=∠EMC,求CE的长;
(3)以点D为圆心,DA为半径作圆,⊙D与⊙M的公共弦恰好经过梯形的一个顶点,求此时⊙M的半径长.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712437771747328/2715078800588800/STEM/6127ff92-eeb5-45a6-a864-aee66ba62368.png)
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名校
【推荐2】已知:
中,
是直径,弦
.
如图1,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d268f81db19ff5c5425ee1fe221caf98.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/457919465bfc4dac80ce59bdacc5a989.png?resizew=148)
如图2,点
在圆上,连接
,若
,求
的值;
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/eaeb1a9789ed463cad8ddeb54ca98b60.png?resizew=136)
如图3,在
的条件下,分别延长线段
交于点
,过
作
于
,连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bdb3995265a321989202ff01001013d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d268f81db19ff5c5425ee1fe221caf98.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/457919465bfc4dac80ce59bdacc5a989.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56903a24a292c8eaa32df4e9f664018a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5df11d572b83b9edf76aadd1dadc6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d85886e206ef05d51c88d09ad707bc.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/eaeb1a9789ed463cad8ddeb54ca98b60.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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