如图,在Rt△ABC中,∠C=90˚,tanA
,BC=6,求AC的长和sinA的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d6663162b32fc56db083f6d6ea255d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/80392346-20ab-4609-b7db-aa4e70611113.png?resizew=151)
20-21九年级上·全国·课后作业 查看更多[9]
(已下线)第19课时 锐角三角函数(基础练)-2020-2021学年九年级数学上册十分钟同步课堂专练(华师大版)北京市海淀区清华大学附属中学将台路校区2020-2021学年九年级上学期期末数学试题江西省吉安市峡江县2020-2021学年九年级上学期期末数学试题福建省莆田第八中学2021-2022学年九年级上学期第三次月考数学试题(已下线)专题7.3 解直角三角形(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)专题28.3 解直角三角形(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(人教版)(已下线)专题7.1 锐角三角函数定义及增减性(知识解读)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)专题1.1 锐角三角函数(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(北师大版)福建省莆田第九中学2023?2024学年九年级上学期第二次月考数学试题
更新时间:2020-11-11 19:18:36
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解答题-问答题
|
适中
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名校
【推荐1】如图,在四边形
中,
,
,
,
.点
从点
出发,以每秒
的速度沿折线
方向运动,点
从点
出发,以每秒
的速度沿线段
方向向点
运动.已知动点
,
同时发,当点
运动到点
时,
,
运动停止,设运动时间为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/e33ae250-c95a-4d2d-963b-ff0f9ee3622f.png?resizew=160)
(1)直接写出
的长(cm);
(2)当四边形
为平行四边形时,直接写出四边形
的周长(cm);
(3)在点
、点
的运动过程中,是否存在某一时刻,使得
的面积为
?若存在,请求出所有满足条件的
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7855d1e3b0547de1d0ea11dfd20161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7730fa4c4f08f2b855dcb084f60a6b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b75de58fd430903fa4fcaf23dfd7483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d8c72088c5ebef12ba11a92d6d1ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372907693e25eead2395b1a69fef42c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08075b3b73dd2609baad69a496fdd9a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/e33ae250-c95a-4d2d-963b-ff0f9ee3622f.png?resizew=160)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42d53a48595e6f0be79d75a12938e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42d53a48595e6f0be79d75a12938e89.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d378f2bb77b7b8c0768fc1764549fcfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3777a9755ca2b019753074095529fc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08075b3b73dd2609baad69a496fdd9a8.png)
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解答题-证明题
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适中
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【推荐1】如图,在矩形ABCD中,点E在边CD上,将该矩形沿AE折叠,使点D落在边BC上的点F处,过点F作FG∥CD,交AE于点G连接DG.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/6f0f5e83-580b-4744-b359-942e0d29fb04.png?resizew=215)
(1)求证:四边形DEFG为菱形;
(2)若CD=8,CF=4,求sin∠BAF的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/6f0f5e83-580b-4744-b359-942e0d29fb04.png?resizew=215)
(1)求证:四边形DEFG为菱形;
(2)若CD=8,CF=4,求sin∠BAF的值.
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解答题-作图题
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适中
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【推荐2】如图,已知锐角
中,
.
交
于点
,使
上各点到边
和边
的距离相等;作
的外接圆
;(不写作法,保留作图痕迹)
(2)在(1)的条件下,若
,
的半径为5,则
__________.(如需画草图,请使用图2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f337672e597ddd5447def56c0d890cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72511f149a1b13af02d0e1421d3a63a5.png)
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解答题-证明题
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【推荐1】如图,
是
的直径,点
在
上,
是
的切线,
,
的延长线与
交于点
.
;
(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/c5db41a1f31d6baee7c69990811edb9f.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/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4b5ad8d52ae816f6cbd9a83463738f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da34ca79dff70e12ee89de5a28673b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,
,
,延长对角线
到点E,使
,连接DE,过点E作
交
的延长线于点F.
(1)求证:四边形
是菱形;
(2)若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa18c2a78c400c80a5760743f31771c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f0743c33f3a8a7cae0e1c8a28be0e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/28/e43a86b2-cc4d-4cd1-abb6-eacf5174e478.png?resizew=172)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5490dba7da9a3f60c2f9440b2ddd0162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,
,O是
上的一点,以点O为圆心,
的长为半径作
,且
与
相切于点H,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/535bd30e-b9d6-44fc-9de8-8c044c013e86.png?resizew=151)
(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/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/535bd30e-b9d6-44fc-9de8-8c044c013e86.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1329f0625ccbdbf61ef6bd732ced0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
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适中
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【推荐2】如图,无人机在600米高空的P点,测得地面A点和建筑物BC的顶端B的俯角分别为60°和70°,已知A点和建筑物BC的底端C的距离为286
米,求建筑物BC的高.(结果保留整数,参考数据:
≈1.73,sin70°≈0.94,cos70°≈0.34,tan70°≈2.75)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/67b1f2c5-cec8-4b98-9835-ebf643ccf016.png?resizew=180)
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