如图1,在等腰△ABC中,AB=AC=12,以AB为直径的⊙O交BC于点D,交AC于点E,点M为AC边上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/307dd312-e510-43f0-b922-29ee17197f1a.png?resizew=365)
(1)若
.求
的长度;
(2)如图2,连接DM,当DM⊥AC时,求证:DM是⊙O的切线;
(3)如图3,在(2)的条件下,延长MD,交AB的延长线于N,若DN=8,求MC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/307dd312-e510-43f0-b922-29ee17197f1a.png?resizew=365)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10ad623f3a05ecdc27b3f3e0169669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
(2)如图2,连接DM,当DM⊥AC时,求证:DM是⊙O的切线;
(3)如图3,在(2)的条件下,延长MD,交AB的延长线于N,若DN=8,求MC的长.
2022·河北保定·一模 查看更多[2]
更新时间:2022-09-08 17:54:29
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】请用无刻度的直尺,根据下列条件分别找到图1中的圆心
和图2中的圆心
的位置.(保留作图痕迹,不写作法)
(1)在图1中,以
为公共边的两个正方形
和
在
内,顶点
,
在
上;
(2)在图2中,已知正方形
在
内,顶点
,
在
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)在图1中,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80a0e428cb894bfd09a6129a73ea4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e825de4e5ade72e45a28c8f75b1dea.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/3d97cdc586744d208b6f69c9813af977.png)
(2)在图2中,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.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/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://img.xkw.com/dksih/QBM/2019/12/19/2358468163878912/2358515932553216/STEM/83ca3c375beb49dd860d508e02888961.png?resizew=238)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,矩形
中,
,
,点
从点
出发沿
以
的速度向点
移动;点
从点
出发沿
以
的速度向点
移动.设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/043b324a-e409-443d-86a1-a0a2af2a1d65.png?resizew=273)
(1)当
时,
的面积为
.
(2)在运动过程中
的面积能否为
?如果能,求出
的值,若不能请说明理由;
(3)运动过程中,当点
,
,
,
四个点恰好在同一个圆上时,求
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a674be86c785995898ec30d6799568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ca8c9e1c0aedffcd3a6e734932e944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f051275aa34c90fd6957973f6640753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/043b324a-e409-443d-86a1-a0a2af2a1d65.png?resizew=273)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b42beec389982a69a715ba64d4e684a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46dd926f200fa1b7749c87aeb90b9c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7253bf413f68354e6a9d629a98bc35.png)
(2)在运动过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46dd926f200fa1b7749c87aeb90b9c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e086b07578201f26df1319ef67831788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)运动过程中,当点
![](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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,
中,
,点
,
分别在
,
上,
,
经过点
,
,弦
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712452910219264/2722416655171584/STEM/8cbfa69d-c9dc-41ef-98c8-644e682ec1ff.png)
(1)求证:
为
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712452910219264/2722416655171584/STEM/8cbfa69d-c9dc-41ef-98c8-644e682ec1ff.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402c0f9eecfcdf73f9e87ca82a6f2c5.png)
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(0.65)
名校
【推荐2】如图,
是
的直径,
,
是
的弦,
为弦
的中点,
与
交于点
,过点
作
,交
的延长线于点
,且
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/d543c65e-fd3e-4461-88d4-310158625ee2.png?resizew=134)
(1)求证:
是
的切线;
(2)求证:
;
(3)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/d543c65e-fd3e-4461-88d4-310158625ee2.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9742d8aa9a0170e0278fe2f814b33fb1.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea147ada4f0aefdd3808a6a1133792eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d89be3b225846e0df0d4262344d974d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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名校
【推荐1】石家庄市水上公园南侧新建的摩天轮吸引了附近市民的目光.据工作人员介绍,新建摩天轮直径为100m,最低点距离地面1m,摩天轮的圆周上均匀地安装了24个座舱(本题中将座舱视为圆周上的点),游客在距离地面最近的位置进舱,运行一圈时间恰好是13分14秒,寓意“一生一世”.小明从摩天轮的底部出发开始观光,摩天轮转动1周.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/2ad923a7-e9ca-475e-8cc0-a717c68ebd31.png?resizew=515)
(1)小明所在座舱到达最高点时距离地面的高度为 m;
(2)在小明进座舱后间隔3个座舱小亮进入座舱(如图,此时小明和小亮分别位于P、Q两点),
①求两人所在座舱在摩天轮上的距离(弧
的长);
②求此时两人所在座舱距离地面的高度差;
(3)受周围建筑物的影响,当乘客与地面的距离不低于
时,可视为最佳观赏位置,求最佳观赏时间有多长(不足一分钟按一分钟记).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/2ad923a7-e9ca-475e-8cc0-a717c68ebd31.png?resizew=515)
(1)小明所在座舱到达最高点时距离地面的高度为 m;
(2)在小明进座舱后间隔3个座舱小亮进入座舱(如图,此时小明和小亮分别位于P、Q两点),
①求两人所在座舱在摩天轮上的距离(弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
②求此时两人所在座舱距离地面的高度差;
(3)受周围建筑物的影响,当乘客与地面的距离不低于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd5a56c8b0b25975edf5059da810e49.png)
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真题
【推荐2】2023年5月30日,“神舟十六号”航天飞船成功发射.如图,飞船在离地球大约
的圆形轨道上,当运行到地球表面P点的正上方F点时,从中直接看到地球表面一个最远的点是点Q.在
中,
.
(参考数据:
)
的值(精确到
);
(2)在
中,求
的长(结果取整数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bcb74e7cb4235102c7b8eda1f504f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdeb69ddd85c7c94c1c58da02768223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c63cd932f28b00efded74063dabf9a.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d10d938106acd355a61458ec739f9b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a6b11637ea396e989ab32d780e745b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在矩形
中,
,连结对角线
.点M为线段
上的一点,点N为线段
上的一点,连结
.回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/304644f6-e698-407f-a62e-d370350170a6.png?resizew=207)
(1)当点M为
的中点且
时,求
的长.
(2)当
且
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c174743f61c6a0952fc836a2dd5bcf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/304644f6-e698-407f-a62e-d370350170a6.png?resizew=207)
(1)当点M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee50a23604ea2a9c1f3649dab97c2e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e5c289b8aabdbfba95c7fd1e1842f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知
中,
,
为钝角,以
为直径的
交
于点
,
的延长线与
相交于点
,连结
.
(1)求证:
;
(2)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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d342fa993df063e9c4084f5942962733.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2019/11/7/2328831752495104/2328867491872768/STEM/bc95325f118945b48387c5ff05027d7a.png?resizew=171)
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解答题-问答题
|
适中
(0.65)
【推荐3】某市著名景点“凤凰楼”,一耸入云的文化丰碑,坐落于凤凰山之巅
周末,阳光明媚,小明、小芳等同学一起登凤凰山,在山顶,他们想用一些测量工具和所学知识测量“凤凰楼”的高度来检验自己掌握知识和运用知识的能力
他们经过观察发现,观测点与“凤凰楼”底部间的距离不易测得,因此他们运用如下方法来进行测量:如图,小芳在小明和“凤凰楼”之间的直线BM上放一平面镜,在镜面上做一个标记,这个标记在直线BM上对应位置为点C,镜子不动,小明看着镜面上的标记,他来回走动,走到点D时,看到“凤凰楼”顶端点A在镜面中的像与镜面上的标记重合,这时,测得小明眼睛与地面的高度
米,
米,然后,小明从点D沿DM方向走了24米,到达“凤凰楼”影子的末端F处,此时,测的小明身高FG的影长
米,
米
如图,已知
,
,
,其中,测量时所使用的平面镜厚度忽略不计
请你根据题中提供的相关信息,求出“凤凰楼”的高AB的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2eb372ce201bcf4d3d538df3f84527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadc75e9d627eb956ee0eeafff2be22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53db98b555a724efb0e048057fd59edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/704095a6e8f5a9f93f5f9de90682c08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff59006451bc9122875ad2581bbe6874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814158e73e6fe64a28743853cda8226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7908c7cd0a013f7e8f7c76612afd68a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/9020a26b-8b80-4e3d-a18a-27dbc241f2df.png?resizew=414)
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