如图,水平地面上有一幢高为AD的楼,楼前有坡角为30°、长为6米的斜坡.已知从A点观测B、C的俯角分别为60°和30°
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/c1ae2f52-5289-474e-83f3-11c69c74394a.png?resizew=379)
(1)求楼高;
(2)现在要将一个半径为2米的⊙O从坡底与斜坡相切时的⊙O1位置牵引滚动到斜坡上至圆刚好与斜坡上水平面相切时的⊙O2位置,求滚动过程中圆心O移动的总长度.(参考数据:tan15°=2﹣
)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/c1ae2f52-5289-474e-83f3-11c69c74394a.png?resizew=379)
(1)求楼高;
(2)现在要将一个半径为2米的⊙O从坡底与斜坡相切时的⊙O1位置牵引滚动到斜坡上至圆刚好与斜坡上水平面相切时的⊙O2位置,求滚动过程中圆心O移动的总长度.(参考数据:tan15°=2﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
更新时间:2020-01-05 16:12:09
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解答题-证明题
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【推荐1】如图所示,
是
的直径,
与
相切于点
,与
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447706305748992/2448303496151040/STEM/4f7ee640-7ce3-4da9-803b-045dde1b216e.png?resizew=256)
(1)求证:
;
(2)若
,
,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/9d78abbad68bbbf12af10cd40ef4c353.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447706305748992/2448303496151040/STEM/4f7ee640-7ce3-4da9-803b-045dde1b216e.png?resizew=256)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32106516d425fded8b415bc8bf401a5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebe9f3fe31618f73233410485262901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,在
中,
,点O为
边上一点,以
为半径的
与
相切于点D,分别交
,
边于点E,F.
(1)求证:
平分
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/bb678b54-a862-4f9d-b86b-82cc3f6965ae.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa15d862c41c1a7aa2a1dcd96891f3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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名校
【推荐3】【了解概念】
定义提出:有一组邻边相等的凸四边形叫做“等邻边四边形”.
【理解运用】
(1)如图1,在
的正方形网格中,每个小正方形的顶点称为格点,每个小正方形的边长均为1,线段
的端点均在格点上,在图1的方格纸中画出一个等邻边四边形
,要求:点D在格点上;
(2)如图2,在等邻边四边形
,
,
,
,
,求
的长;
【拓展提升】
(3)如图3,在平面直角坐标系中,矩形
的顶点A、C分别在x、y轴正半轴上,已知
,
,D是
的中点.在矩形
内或边上,是否存在点E,使四边形
为面积最大的“等邻边四边形”,若存在,请求出四边形
的最大面积及此时点E的坐标;若不存在,请说明理由.
定义提出:有一组邻边相等的凸四边形叫做“等邻边四边形”.
【理解运用】
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,在等邻边四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5441d73845911db1993bf903c4d8700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bae651529e60da7d1de9c997206cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
【拓展提升】
(3)如图3,在平面直角坐标系中,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd3fd00798e7ec50afafe7fa7a4f42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434845564fd5765244f8d1aa9240fa39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
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解答题-问答题
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【推荐1】如图,在大楼
的正前方有一斜坡
米,坡角
,小红在斜坡下的点
处测得楼顶
的仰角为
在斜坡上的点
处测得楼顶
的仰角
为其中点
在同一直线上.
![](https://img.xkw.com/dksih/QBM/2020/5/16/2464161363443712/2464821875318784/STEM/1116f20d054e4c2abfd7ca582017ccfd.png?resizew=223)
(1)求斜坡
的高度
;
(2)求大楼
的高度(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc885b86f84278fbbba640cff6b8e3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdebc1592efdbdf58b9b0dd9ee725c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0d15ac7f7dffd33460d94cf9f5c018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://img.xkw.com/dksih/QBM/2020/5/16/2464161363443712/2464821875318784/STEM/1116f20d054e4c2abfd7ca582017ccfd.png?resizew=223)
(1)求斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求大楼
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图是某导弹发射车在山顶A处进行射击训练的示意图,点A在y轴上,与原点O的距离是8百米(为了计算方便,我们把本题中的距离用百米作单位).此导弹发射车在A处进行某个角度的射击训练,点M是导弹向右上射出后某时刻的位置.忽略空气阻力,实验表明:导弹射出t秒时,点M,A的水平距离是vt百米,点M与x轴(水平)的竖直距离是(8+vt﹣5t2)百米(v的值由发射者设定).在点A和x轴上的点B处观测射击目标P的仰角分别是a和β,OB=3百米,tanα=
.tanβ=
.
(1)若v=7,完成下列问题:
①当点M,A的水平距离是7百米时,点M到x轴的距离是 百米;
②设点M坐标为(x,y),求y与x的关系式(不必写x的取值范围).
(2)按(1)的射击方式,能否命中目标P?请说明理由.
(3)目标以m百米/秒的速度从点P向右移动,当v
时,若能使目标被击中,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a734873a608f0c070dec80b89d179754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
(1)若v=7,完成下列问题:
①当点M,A的水平距离是7百米时,点M到x轴的距离是 百米;
②设点M坐标为(x,y),求y与x的关系式(不必写x的取值范围).
(2)按(1)的射击方式,能否命中目标P?请说明理由.
(3)目标以m百米/秒的速度从点P向右移动,当v
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8dacc1f486bc537f1460bcbe35141ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/a49e53e7-5509-451c-9d85-53a92d9c49fc.png?resizew=187)
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【推荐3】综合与实践:测算校门所在斜坡的坡度.
【背景】如图1,某学校校门在一道斜坡上,该校兴趣小组想要测量斜坡的坡度.
到校门所在位置
在斜坡上有15块地砖.
【素材2】在点A处测得仰角
,俯角
;在点B处直立一面镜子,光线
反射至斜坡
的点N处,测得点B的仰角
;测量杆上
,斜坡
上点N所在位置恰好是第9块地砖右边线.
【讨论】只需要在
中选择两个角,再通过计算,可得
的坡度.
【背景】如图1,某学校校门在一道斜坡上,该校兴趣小组想要测量斜坡的坡度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【素材2】在点A处测得仰角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f203ff7d9d5fb367a1002277f5930562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68ee777d5e2196a8d3a9a8c5e0c4db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5716d9be7408a362567a56e8c911f65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885cad977d8ba35cc40c9e5f4df4c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【讨论】只需要在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710bfed103fe7a7fb0dc872b72f2c0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
任务1 | 分析规划 | 选择两个测量角的正切值: 和 .(填“![]() ![]() ![]() |
求![]() | ||
任务2 | 推理计算 | 求坡度![]() |
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