如图,某“综合与实践”小组欲测量当地的一座宝塔AB的高度,他们利用高度为1米的测倾仪在点C处测得该宝塔顶部A的仰角
.由于宝塔底部B不能直接到达,于是他们将测倾仪后退60米到达点D,测得该宝塔顶部A的仰角
.点A,B,测倾仪
和
均在同一平面内,求该宝塔
的高度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0b93f41e2d30d1a48274256074143f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3323f55d5b9f7bae0a1354c3c5905806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/468681d8-36a8-4bce-81f9-eae0909a1aac.jpg?resizew=168)
更新时间:2023-09-15 10:28:59
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相似题推荐
解答题-证明题
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适中
(0.65)
【推荐1】在
中,
,D是边
上一点,以
为直径作
交
于点F,并且
与
相切于点E,连接
.
(1)求证:
;
(2)若
的半径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/a4425e5a-d21f-46e9-8d35-38e2aa59ac80.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2dd7278ae90c7be7cac0e45d938865.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
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【推荐2】已知
半径为
,若点
在
外且
上存在点
使得
,则称点
是
的领域点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/aa624a26-d4dc-4537-8e6c-14e79964de88.png?resizew=416)
(1)对以下情况,用三角板或量角器尝试画图,并判断点
是否是
的领域点(在横线上填“是”或“不是”).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/baae8e59-7d04-41b5-94c4-d3f105da61e0.png?resizew=511)
(2)若点
是
的领域点,则
的取值范围是__________;
(3)如图,以圆心
为坐标原点建立平面直角坐标系
,设直线
与
轴、
轴分别相交于点
.
①若线段
上有且只有一个点是
的领域点,求
的值;
②若线段
上存在
的领域点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1051ef731f266dbf72ccb19dc222bf2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/aa624a26-d4dc-4537-8e6c-14e79964de88.png?resizew=416)
(1)对以下情况,用三角板或量角器尝试画图,并判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/baae8e59-7d04-41b5-94c4-d3f105da61e0.png?resizew=511)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(3)如图,以圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd57b0539fcf57f48fe1dcbf90b506e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fd6c9f7b7c9fa4822aa81eb13799ae.png)
①若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
②若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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解答题-问答题
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适中
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【推荐1】如图,在6×8的网格纸中,每个小正方形的边长都为1,动点P、Q分别从点D、A同时出发向右移动,点P的运动速度为每秒2个单位,点Q的运动速度为每秒1个单位,当点P运动到点C时,两个点都停止运动.
(1)求BD的长;
(2)求运动时间t为多少秒时,
为等腰三角形?
(1)求BD的长;
(2)求运动时间t为多少秒时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/f8016347-2632-4dd6-a873-1d37b642d015.png?resizew=154)
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解答题-作图题
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适中
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【推荐2】在三角形纸片
中,仅折叠该纸片两次,就能分别在
上得到点D、E、F,使四边形
为菱形.
.(不写作法,保留作图痕迹)
(2)若
,则菱形
的面积为 .(如需画草图,请使用试题中的图2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2add0b4bf4b300829f8a260c299836bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc50ecfa45216f8d098662452cf8d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc50ecfa45216f8d098662452cf8d08.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d242f9bdf52398f3d7e8c3d23750be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc50ecfa45216f8d098662452cf8d08.png)
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解答题-计算题
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【推荐1】2022年10月13日将是第26个国际减灾日,主题是“掌握防灾减灾知识,保护生命安全”,各有关部门要切实加强防灾减灾宣传教育,大力推广和普及科普知识和自救互救技能,逐步提升全民防灾减灾意识.云梯消防车在某小区工作时,云梯臂能达到的最大高度为点C处此时云梯臂
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为3.8米.已知该小区高层住宅楼的层高是2.8米,请你通过计算说明:家住15楼的求救者能被顺利施救吗?(消防员身高、窗台高度等因素不作考虑)(参考数据
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解答题-作图题
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名校
【推荐2】下面是小丁设计的“利用直角三角形和它的斜边中点作矩形”的尺规作图过程.
已知∶如图,在RtΔABC中,∠ABC=90°,O为AC的中点.
作法∶①作射线BO,在线段BO的延长线上取点D,使得DO=BO;
②连接AD,CD,则四边形ABCD为矩形.
根据小丁设计的尺规作图过程.
(1)使用直尺和圆规,在图中补全图形(保留作图痕迹);
(2)完成下面的证明.
证明∶∴点O为AC的中点,
∴AO=CO.
又∵DO=BO,
∵四边形ABCD为平行四边形(__________)(填推理的依据).
∵∠ABC=90°,
∴
ABCD为矩形(_________)(填推理的依据).
已知∶如图,在RtΔABC中,∠ABC=90°,O为AC的中点.
作法∶①作射线BO,在线段BO的延长线上取点D,使得DO=BO;
②连接AD,CD,则四边形ABCD为矩形.
根据小丁设计的尺规作图过程.
(1)使用直尺和圆规,在图中补全图形(保留作图痕迹);
(2)完成下面的证明.
证明∶∴点O为AC的中点,
∴AO=CO.
又∵DO=BO,
∵四边形ABCD为平行四边形(__________)(填推理的依据).
∵∠ABC=90°,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
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