如图,海岛B在海岛A的北偏东
方向,且与海岛A相距20海里,一艘渔船从海岛B出发,以5海里/时的速度沿北偏东
方向航行,同时一艘快艇从海岛A出发,向正东方向航行.2小时后,快艇到达C处,此时渔船恰好到达快艇正北方向的E处.
(1)求
的度数;
(2)求快艇的速度及C,E之间的距离.
(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/24c63503-22c8-450f-80e0-5a1815f7fc69.png?resizew=177)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
(2)求快艇的速度及C,E之间的距离.
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a3dcc076490463b6d2275c856c61c7.png)
更新时间:2020-07-22 21:30:22
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解答题-证明题
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适中
(0.65)
【推荐1】如图,
是
的直径,C为
上一点,
和过点C的切线互相垂直,垂足为D,
交
于点E,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/4fe88939-d791-487b-9346-d9be5c5b8bf6.png?resizew=126)
(1)求证:
平分
;
(2)求
的半径.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/4fe88939-d791-487b-9346-d9be5c5b8bf6.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-应用题
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适中
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【推荐2】某校八年级的王明和孙亮两位同学在学习了“勾股定理”之后,为了测得风管的垂直高度
,他们进行了如下操作:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/286d177c-9e0d-4dce-8477-7d772b637e32.png?resizew=122)
①测得
的长度为8米;(注:
)
②根据手中剩余线的长度计算出风筝线
的长为17米;
③牵线放风筝的王明身高
米;(注:
)
求风筝的垂直高度
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/286d177c-9e0d-4dce-8477-7d772b637e32.png?resizew=122)
①测得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
②根据手中剩余线的长度计算出风筝线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
③牵线放风筝的王明身高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385f8ed2ee50d16bfa7001bc794c65e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
求风筝的垂直高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,小明从
点出发,沿北偏东
方向行驶到达
处,接着向正南方向行驶![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6428f1070e164daf2399e679b8932a.png)
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米到达
处.在
处观测到出发时所在的
处在北偏西
方向上,
,
两处相距多少米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,一艘船由
港沿北偏东70°方向航行
海里到达
港,然后再沿北偏西35°方向航行至
港,
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