如图,某大楼的顶部竖有一块广告牌CD,小马同学在山坡的坡脚A处测得广告牌底部D的仰角为53°,沿坡面AB向上走到B处测得广告牌顶部C的仰角为45°,已知山坡AB的坡比i=1:
,AB=10米,AE=21米.(测角器的高度忽略不计,参考数据:
,
,
,
,
.)
(1)求点B距水平地面AE的高度.
(2)若市政规定广告牌的高度不得大于7米,请问该公司的广告牌是否符合要求,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fe9cc87f8e8389c94efa7e7caab2a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad548d3bb499aab6d0baf4032be99bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664a5f9b61fd010eda340986ca34b47.png)
(1)求点B距水平地面AE的高度.
(2)若市政规定广告牌的高度不得大于7米,请问该公司的广告牌是否符合要求,并说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872510889500672/2876766730551296/STEM/68b66bd2-7643-4e6a-9157-ebbabf5a669e.png?resizew=151)
更新时间:2021-12-20 20:19:48
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【推荐1】如图,在
中,
,
是
的中点,动点
从点
出发,沿
以每秒5个单位的速度向终点
运动,连结
,以
为邻边作平行四边形
.设点
的运动时间为
(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/b1d5b46a-683e-4ab9-b3e6-0cdbd05b3ce3.png?resizew=124)
(1)
的长是_____________.
(2)当
时,求
的值.
(3)当平行四边形
是轴对称图形时,求
的值.
(4)作点
关于直线
的对称点
,当
时,直线
与
的某一条边垂直,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9635c72cc8950ebbe6584ba8a394685d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75ce2dab30e5c1c2648017540efd7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cdefde4fe3f81ce29c680146d69e6e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/b1d5b46a-683e-4ab9-b3e6-0cdbd05b3ce3.png?resizew=124)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824938c27f63ba9b36eaea6cdd389e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cdefde4fe3f81ce29c680146d69e6e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc4cbc9bf8068d76b4885cd6c17d9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3f7368811340328acf5be13f499d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图,在直角梯形
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/51db9161-dd71-4e68-b75d-a74666055d0d.png?resizew=217)
(1)求梯形
的面积;
(2)联结
,求
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde611295c604384dadd6ba54d031bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14fe11bc204b5d1df3a14ed54a800e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d758ff40da90d1872c246469bf281c5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/51db9161-dd71-4e68-b75d-a74666055d0d.png?resizew=217)
(1)求梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
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【推荐1】已知:如图,在△ABC中,AB=AC,AD是△ABC的一条角平分线,AN是△ABC外角∠CAM的平分线,CE⊥AN,垂足为点E.
(1)求证:四边形ADCE为矩形;
(2)连接DE,交AC于点F,请判断四边形ABDE的形状,并证明;
(3)线段DF与AB有怎样的关系?请直接写出你的结论.
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【推荐2】我国明代有一位杰出的数学家提出一道“荡秋千”的数学问题:“平地秋千未起,踏板一尺离地,送行二步与人齐,五尺人高曾记;仕女佳人争蹴,终朝笑语欢嬉,良工高士素好奇,算出索长有几?”其意思为:如图,当秋千静止在地面上时,秋千的踏板离地的距离为一尺(
尺),将秋千的踏板往前推两步(每一步合五尺,即
尺),秋千的踏板离地面的距离与人一样高,这个人的身高为五尺(
尺),
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/e93633ba-80d9-4270-a956-64acebc5c8e0.png?resizew=281)
(1)图
所示
______尺
(2)求这个秋千的绳索
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf90f5b639e3262a07f89bc4bb85566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f976992ea06276366feec99b8e8e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb0616f82d28297ed9cfc586ab1fefd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/e93633ba-80d9-4270-a956-64acebc5c8e0.png?resizew=281)
(1)图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140e540849151c98a71e423aa443b39e.png)
(2)求这个秋千的绳索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
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【推荐3】人教版初中数学教科书八年级下册第53页告诉我们直角三角形的一个性质:“直角三角形斜边上的中线等于斜边的一半”,我们一起来探究这条性质的证明过程:
如图1,在Rt△ABC中,∠ACB=90°,CD是斜边AB上的中线.
求证:
.
证明:延长CD至点E,使DE=CD,连结AE、BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/9b69599c-a387-4e07-9669-514569294d69.png?resizew=266)
(1)请你根据以上提示,结合图形,写出完整的证明过程;
(2)定理应用:如图2,Rt△ABC中,∠ACB=90°,点D为边AC上一点,DE⊥AB于点E,连接BD,点M为BD的中点,CM的延长线交AB于点F,连接EC、EM.求证:△CME为等腰三角形.
如图1,在Rt△ABC中,∠ACB=90°,CD是斜边AB上的中线.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:延长CD至点E,使DE=CD,连结AE、BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/9b69599c-a387-4e07-9669-514569294d69.png?resizew=266)
(1)请你根据以上提示,结合图形,写出完整的证明过程;
(2)定理应用:如图2,Rt△ABC中,∠ACB=90°,点D为边AC上一点,DE⊥AB于点E,连接BD,点M为BD的中点,CM的延长线交AB于点F,连接EC、EM.求证:△CME为等腰三角形.
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【推荐1】如图,用长为40cm的细铁丝围成一个矩形
.
![](https://img.xkw.com/dksih/QBM/2021/10/23/2835425151066112/2837118997020672/STEM/ee8bbbed-c758-4402-9930-5fcaf66802f8.png)
(1)若这个矩形的面积等于
,求
的长度;
(2)这个矩形的面积可能等于
吗?若能,求出
的长度,若不能,说明理由;
(3)若这个矩形为黄金矩形(
与
之比等于黄金比
),求该矩形的面积.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83c15e14023ca74a365b685f363a87c.png)
![](https://img.xkw.com/dksih/QBM/2021/10/23/2835425151066112/2837118997020672/STEM/ee8bbbed-c758-4402-9930-5fcaf66802f8.png)
(1)若这个矩形的面积等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a9b6a360130532cf7ba3cba89dcda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)这个矩形的面积可能等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ceac2baf8df2d2b2824f7d59a0e1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若这个矩形为黄金矩形(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
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【推荐2】如图,在
中,
,
,
,点
是
上一点,将
沿着
对叠,点
恰好落在
上,对应点为点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/4b51c2d3-557d-46a5-97a3-313dbcc71859.png?resizew=339)
(1)求
的长;
(2)点
是
上一点,
与
交于点
.
(ⅰ)如图2,当
时,求
的值;
(ⅱ)如图3,当点
是
的中点时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/4b51c2d3-557d-46a5-97a3-313dbcc71859.png?resizew=339)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(ⅰ)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8944bb1af77920b5018eebf3af16b2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b963c9facac1d81904412ce48d4c524d.png)
(ⅱ)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab63cec9b8be2f46673f4af414853f8.png)
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【推荐1】如图,
为
的直径,
为弦,
.
是
的切线;
(2)连接
,如果
恰好经过弦
的中点E,且
,
,求直径
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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab84416b6926361f411b0a595235537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a091e9e93d56b9515bcb35ee72602250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】抛物线
与x轴交于
、B两点(A在B的左侧),与y输交于点
,抛物线的顶点为M.
(2)若点P是线段
上一个动点,连接
.问,是否存在点P,使得以点O、C、P为顶点的三角形与
相似?若存在,求出P点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531b752c4d04408a7332719ea3845786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd81cac5d2bcf0753819951088027d1.png)
(2)若点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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