【了解概念】
我们知道,折线段是由两条不在同一直线上且有公共端点的线段组成的图形.如图1,线段
、
组成折线段
.若点
在折线段
上,
,则称点
是折线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/85d9ce09-ddb4-4ab4-befe-7dcb66b4cb63.png?resizew=414)
(1)如图2,
的半径为2,
是
的切线,
为切点,点
是折线段
的中点.若
,则
;
(2)【定理证明】阿基米德折弦定理:如图3,
和
是
的两条弦(即折线段
是圆的一条折弦),
,点
是
的中点,从
向
作垂线,垂足为
,求证:
是折弦
的中点;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/6e54407b-f408-4af2-b404-f294073946c0.png?resizew=543)
【变式探究】
(3)如图4,若点
是
的中点,【定理证明】中的其他条件不变,则
、
、
之间存在怎样的数量关系?请直接写出结论.
【灵活应用】
(4)如图5,
是
的直径,点
为
上一定点,点
为
上一动点,且满足
,若
,
,则
.
我们知道,折线段是由两条不在同一直线上且有公共端点的线段组成的图形.如图1,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce2790947716b1cfa9c5e7a65db4093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/906faf4815cabc84c56acae19ebeb048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/906faf4815cabc84c56acae19ebeb048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774c1b6955eff63ddee38c0fffa5a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/906faf4815cabc84c56acae19ebeb048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/85d9ce09-ddb4-4ab4-befe-7dcb66b4cb63.png?resizew=414)
(1)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83efd6afec2f73c52e4b027a12d9f817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172bf45ffccc96f853e8df18a2e0245a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
(2)【定理证明】阿基米德折弦定理:如图3,
![](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/b7c4e3cf5aa65a81a357c97a6b7ee5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/6e54407b-f408-4af2-b404-f294073946c0.png?resizew=543)
【变式探究】
(3)如图4,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
【灵活应用】
(4)如图5,
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4cb73e9d976cbfe9c590044fa69dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
22-23九年级上·江苏盐城·期中 查看更多[4]
江苏省盐城市盐都区2022-2023学年九年级上学期期中数学试题江苏省盐城市盐都区第一共同体2022-2023学年九年级上学期期中数学试题江苏省淮安市盱眙县2023-2024学年九年级上学期期中数学试题(已下线)(期中期末真题汇编)第24章 圆 (分层精练)-【题型分类精粹】2023-2024学年九年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)
更新时间:2023-01-10 18:11:51
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】已知:菱形ABCD,AB=4m,∠B=60°,点P、Q分别从点B、C同时出发,沿线段BC、CD以1m/s的速度向终点C、D运动,运动时间为t秒.
(1)如图1,连接AP、AQ、PQ,试判断△APQ的形状,并说明理由
(2)如图2,当t=1.5秒时,连接AC,与PQ相交于点K.求AK的长.
(3)如图3,连接AC交BD于点O,当P、Q分别运动到点C、D时,将∠APQ沿射线CA方向平移,使点P与点O重合,然后以点O为旋转中心将∠APQ旋转一定的角度,使角的两边分别于CD、AD交于S、K点,再以OS为一边在∠SOC内作∠SOT,使∠SOT=∠BDC,OT边交BC的延长线于点T,若BT=4.8,求AK的长.
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485190643728384/2492248438374400/STEM/c88ca146b6dd4308bebe6705b19a3294.png?resizew=314)
(1)如图1,连接AP、AQ、PQ,试判断△APQ的形状,并说明理由
(2)如图2,当t=1.5秒时,连接AC,与PQ相交于点K.求AK的长.
(3)如图3,连接AC交BD于点O,当P、Q分别运动到点C、D时,将∠APQ沿射线CA方向平移,使点P与点O重合,然后以点O为旋转中心将∠APQ旋转一定的角度,使角的两边分别于CD、AD交于S、K点,再以OS为一边在∠SOC内作∠SOT,使∠SOT=∠BDC,OT边交BC的延长线于点T,若BT=4.8,求AK的长.
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485190643728384/2492248438374400/STEM/c88ca146b6dd4308bebe6705b19a3294.png?resizew=314)
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485190643728384/2492248438374400/STEM/188dc37694e5423eada848c98d0f6a85.png?resizew=322)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】在平面直角坐标系
中,抛物线
(
,
、
为常实数)交
轴于
、
两点,与
轴交于
点.
(1)如图1,若
在此抛物线上,求出这个抛物线解析式;
(2)如图
,在(
)的条件下,
为(
)中抛物线第四象限一动点,连
、
,求能使四边形
面积最大时的
点坐标;并求出四边形
的最大面积.
(3)将抛物线平移到以坐标原点
为顶点的位置,
为坐标系
轴正半轴上一点,
、
为平移后的抛物线上两点,
始终在
点左边,连
、
、
,若
、
点横坐标分别为
、,则当
为等腰直角三角形,且
时,求
、
间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d039de5bf810e3ff6b0b6096fa48d462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/a77fc6c5-09c4-4bd9-b910-cb120c55ddec.png?resizew=353)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b55b2acefe058f03ed6717c5727447.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfde71e2895fc81fa73a4905fb27e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfde71e2895fc81fa73a4905fb27e57.png)
(3)将抛物线平移到以坐标原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fd792376c623d8299f554b46486f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】已知:在平面直角坐标系中,O为坐标原点,抛物线y=ax2﹣2ax﹣3a分别交x轴于A、B两点(点A在点B的侧),与y轴交于点C,连接AC,tan∠ACO=
.
![](https://img.xkw.com/dksih/QBM/2019/6/1/2216375413112832/2217155310469120/STEM/5fae79b66e34479fab5f26739075ea8a.png?resizew=554)
(1)如图l,求a的值;
(2)如图2,D是第一象限抛物线上的点,过点D作y轴的平行线交CB的延长线于点E,连接AE交BD于点F,AE=BD,求点D的坐标;
(3)如图3,在(2)的条件下,连接AD,P是第一象限抛物线上的点(点P与点D不重合),过点P作AD的垂线,垂足为Q,交x轴于点N,点M在x轴上(点M在点N的左侧),点G在NP的延长线上,MP=OG,∠MPN﹣∠MOG=45°,MN=10
.点S是△AQN内一点,连接AS、QS、NS,AS=AQ,QS=
SN,求QS的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://img.xkw.com/dksih/QBM/2019/6/1/2216375413112832/2217155310469120/STEM/5fae79b66e34479fab5f26739075ea8a.png?resizew=554)
(1)如图l,求a的值;
(2)如图2,D是第一象限抛物线上的点,过点D作y轴的平行线交CB的延长线于点E,连接AE交BD于点F,AE=BD,求点D的坐标;
(3)如图3,在(2)的条件下,连接AD,P是第一象限抛物线上的点(点P与点D不重合),过点P作AD的垂线,垂足为Q,交x轴于点N,点M在x轴上(点M在点N的左侧),点G在NP的延长线上,MP=OG,∠MPN﹣∠MOG=45°,MN=10
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】如图,线段
,点
是线段
延长线上的点,
,点
是线段
延长线上的点,
,以
为圆心,
为半径作扇形
,
.点
是弧
上的点,联结
、
.
![](https://img.xkw.com/dksih/QBM/2022/4/17/2959995925659648/2962211403309056/STEM/93d769c4-0048-4b16-b8e0-15bc7370fec0.png?resizew=183)
(1)联结
交弧
于
,当
时,求
的长;
(2)当以
为半径的
和以
为半径的
相切时,求
的值;
(3)当直线
经过点
,且满足
时,求扇形
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c0b5a1c73f6be6c67bab0f91018479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4884870e010bd05c4d74183e86d2d939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cefe9f8f26cbd2478fb8bcc6478869d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/2022/4/17/2959995925659648/2962211403309056/STEM/93d769c4-0048-4b16-b8e0-15bc7370fec0.png?resizew=183)
(1)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)当以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5df04b055372951c302f0418b0b109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】在等腰△ABC中,AC=AB,D是BC延长线上一点,E是线段AB上一点,连接DE交AC于点F.
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929105670119424/2932448594591744/STEM/82be7a4f-92e2-4979-89b7-0e804b73e22c.png?resizew=774)
(1)如图1,求证:
;
(2)如图2,若∠A=90°,DF=EF,DF:AE=5:3,DF=2,求CD的长;
(3)如图3,若∠1=60°,BC=2CD=6,E在直线AB上运动,以DE为斜边向上构造直角△DTE,且∠E=30°,请直接写出CT的最小值是 .
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929105670119424/2932448594591744/STEM/82be7a4f-92e2-4979-89b7-0e804b73e22c.png?resizew=774)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa7326f5329649b1ca7118d22634400.png)
(2)如图2,若∠A=90°,DF=EF,DF:AE=5:3,DF=2,求CD的长;
(3)如图3,若∠1=60°,BC=2CD=6,E在直线AB上运动,以DE为斜边向上构造直角△DTE,且∠E=30°,请直接写出CT的最小值是 .
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】如图,在等边△ABC中,AB=4cm,动点D从C出发沿线段CB方向以每秒1cm的速度向终点B运动.过点D作DE⊥BC交边AC或AB于点E,在DE的左侧作△DEF,使∠EFD=90°,∠FDE=30°,设点D的运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/3f07c721-563d-4383-a1d4-09449b55b85b.png?resizew=145)
(1)直接写出EF的长度(用含t的代数式来表示).
(2)若点F落在△ABC内部,求t的取值范围.
(3)求△ABC与△DEF重合图形部分的面积S与时间t之间的函数解析式.
(4)若点F关于DE的对称点为P,当点P到△ABC中某两边所在直线的距离相等时,请直接写出t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/3f07c721-563d-4383-a1d4-09449b55b85b.png?resizew=145)
(1)直接写出EF的长度(用含t的代数式来表示).
(2)若点F落在△ABC内部,求t的取值范围.
(3)求△ABC与△DEF重合图形部分的面积S与时间t之间的函数解析式.
(4)若点F关于DE的对称点为P,当点P到△ABC中某两边所在直线的距离相等时,请直接写出t的值.
您最近一年使用:0次
【推荐1】在几何体表面上,蚂蚁怎样爬行路径最短?
(1)如图①,圆锥的母线长为
,B为母线
的中点,点A在底面圆周上,
的长为
.在图②所示的圆锥的侧面展开图中画出蚂蚁从点A爬行到点B的最短路径,并标出它的长(结果保留根号).
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/5f9bf300-3279-4d2d-9278-7ebb9a19461a.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/9504ecdd-0ed1-41d3-a32d-2438f05342b4.png)
(2)图③中的几何体由底面半径相同的圆锥和圆柱组成.O是圆锥的顶点,点A在圆柱的底面圆周上.设圆锥的母线长为l,圆柱的高为h.
①蚂蚁从点A爬行到点O的最短路径的长为________(用含l,h的代数式表示).
②设
的长为a,点B在母线
上,
.圆柱的侧面展开图如图④所示,在图中画出蚂蚁从点A爬行到点B的最短路径的示意图,并写出求最短路径的长的思路.
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/4e2e0a65-f35b-4e39-a089-b7904cd050a3.png)
(1)如图①,圆锥的母线长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc6a8e3c0184a6f39ba69966efee510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf96412cabd4ead64e7fed36c90d9ec.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/5f9bf300-3279-4d2d-9278-7ebb9a19461a.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/9504ecdd-0ed1-41d3-a32d-2438f05342b4.png)
(2)图③中的几何体由底面半径相同的圆锥和圆柱组成.O是圆锥的顶点,点A在圆柱的底面圆周上.设圆锥的母线长为l,圆柱的高为h.
①蚂蚁从点A爬行到点O的最短路径的长为________(用含l,h的代数式表示).
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d90bc7fd910d69984c0e271b916563.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/4e2e0a65-f35b-4e39-a089-b7904cd050a3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749029562376192/2749069355147264/STEM/21823859-b3f5-4c13-8d36-7552c2d1762f.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
解题方法
【推荐2】已知:如图①,在等腰直角
中,斜边
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/fb6b3efb-72a4-4952-895f-ace00800e49e.png?resizew=358)
(1)请你在图①的
边上求作一点
,使得
;
(2)如图②,在(1)问的条件下,将
边沿
方向平移,使得点
、
、
对应点分别为
、
、
,连接
,
.若平移的距离为1,求
的大小及此时四边形
的面积;
(3)将
边沿
方向平移
个单位至
,是否存在这样的
,使得在直线
上有一点
,满足
,且此时四边形
的面积最大?若存在,求出四边形
面积的最大值及平移距离
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/fb6b3efb-72a4-4952-895f-ace00800e49e.png?resizew=358)
(1)请你在图①的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
(2)如图②,在(1)问的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c7bbe0ac1c88c9d35978a7184ba553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a87a4ecef1e321258d8ba11790c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】
内接于
,
,半径为
.
(1)如图1,求
的度数;
(2)如图2,点D在劣弧
上,连接
交
于点E,
,求弦
的长度;
(3)如图3,在(2)的条件下,点F在劣弧
上,连接
交
于点G,延长
、
交于点H,
,
,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa82a15632a545ce2cc6dc998899807.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/6ccf25aa-8f1c-451c-a1a7-bfd6e369afab.png?resizew=783)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)如图2,点D在劣弧
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f600a7f464dde23ad05741183a3a1555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图3,在(2)的条件下,点F在劣弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3baf75b83fd2d111967e7a1e4aabbcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721b375d3ae94f0f90e11d9e45257504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,
为半圆
的直径,
,过
作
的垂线
,点
为直线
上一点,连接
交半圆
于点
,以
为圆心,
为半径作圆弧交
于点
(
不与
重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/5ca0632b-4bcb-4d3e-ad05-ab53a6904673.png?resizew=536)
(1)如图2,连接
、
交于点
,若
为
重心时,求
的值;
(2)如图2,设
,
,求
关于
的函数关系式,并写出定义域;
(3)延长
交
于点
,延长
交射线
于点
,
①设
与线段
交于点
,连接
,
的度数是否发生变化,若不变,请求出度数;若变化,请至少给出两种不同情况下所对应的度数;
②若
与
相似,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3a593f7126c0f4629df5ae20c5500a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/5ca0632b-4bcb-4d3e-ad05-ab53a6904673.png?resizew=536)
(1)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e107ffeef6779a978aca01cf36512767.png)
(2)如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55bda5be4caa88c24327f5cb964a451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9d3ef6ee219fd994504cc1a5f0eef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f986c181183d8e7e45655e6c5b5d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a111d53f28126c3ecd5f18b13770de.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4a56eb2918d8051b176c4363a3fc87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次