北斗卫星是我国自主研发的地球同步轨道卫星,位于赤道正上方,为全球用户提供全天候、全天时、高精度的定位导航等服务.如图,
是地球的平面示意图,点
是一颗北斗卫星,在北纬
的点
(即
)观测,
是点
处的地平线(即
与
相切于点
),测得
,已知地球半径约为
,图中各点均在同一平面内,请计算
的长.(结果精确到
,参考数据:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52deee135d848dbcc44a7b7206e2da80.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/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/a21b40ed3a71cc2cddaadecdc8c9adb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c65671ca5b52fc547183954856ca046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1890f0b4e81634bb7e013412698640f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0e0ff475f32fa5dac263eacc92f379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089e5b6b9ad82acd421f4fb2bc8e5af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b1cd306428f7dc32ff8608f44843bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
更新时间:2024-05-09 22:18:49
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相似题推荐
解答题-证明题
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名校
【推荐1】如图,⊙O是△ABC的外接圆,AB=AC,过点A作AD⊥AB,交⊙O于点D,交BC于点E,过点B作⊙O的切线,与DA的延长线相交于点F.
![](https://img.xkw.com/dksih/QBM/2022/5/5/2979696040296448/2988263852498944/STEM/3032fa2f-0bc6-4706-852e-4a50969f3ece.png?resizew=164)
(1)求证:AF=AE;
(2)若⊙O的半径为2,BE=3,求DE的长.
![](https://img.xkw.com/dksih/QBM/2022/5/5/2979696040296448/2988263852498944/STEM/3032fa2f-0bc6-4706-852e-4a50969f3ece.png?resizew=164)
(1)求证:AF=AE;
(2)若⊙O的半径为2,BE=3,求DE的长.
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适中
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【推荐2】如图,
为
的直径,
是
的切线,
为切点,延长
交
的延长线于点
,
.且交
于点
,连接
,
,
.
(1)求证:
;
(2)若
,
,求
的长.
![](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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.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/3d0aaa5cf7dafac1b64eafe84cae5674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/4/8daec070-eaa2-45a6-848a-b1e57503efe5.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3214c853ea2268ef6c434fb28f0298d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4f58ec0a81d46ff0557b9220ba606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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真题
【推荐1】某居民小区有一朝向为正南方向的居民楼(如图7),该居民楼的一楼是高6米的小区超市,超市以上是居民住房.在该楼的南面15米处要盖一栋高20米的新楼.当冬季正午的阳光与水平线的夹角为32°时.问超市以上的居民住房采光是否有影响,为什么?(结果保留整数,参考数据
,
,
)
![](https://img.xkw.com/dksih/QBM/2011/9/8/1573254718898176/1573254828130304/STEM/8c1dd5062e4043ed8fda0cdcbe3493e4.png)
![](https://img.xkw.com/dksih/QBM/2011/9/8/1573254718898176/1573254828130304/STEM/d46e34ff4d9f41ffb02c70cd9f6ba215.png)
![](https://img.xkw.com/dksih/QBM/2011/9/8/1573254718898176/1573254828130304/STEM/57f9227f1e704aeb8a78f8a7e9081c84.png)
![](https://img.xkw.com/dksih/QBM/2011/9/8/1573254718898176/1573254828130304/STEM/7acf267080084b90a1293f2629d0e541.png)
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【推荐2】如图,是一个放置于水平桌面的平板支架的示意图,底座的高
为
,宽
为
,点
是
的中点,连杆
的长度分别为
和
,
,且连杆
与
始终在同一平面内.
到水平桌面的距离;
(2)产品说明书提示,若点
与
的水平距离超过
的长度,则该支架会倾倒.现将
调节为
,此时支架会倾倒吗?(参考数据∶
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a9fde55ea236718639753330b4ce40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc31bf4b6ed8cf336432a5a2791e67e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3bfba27fe56312acbe718d761794d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)产品说明书提示,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391479c151307826c9765a47a5f10503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a8d63c496ae7a8d36a769606020980.png)
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