1 . 海面上,地球球心角
所对的大圆的圆弧长为1nmile(海里),1nmile是多少千米?(将地球看成球体,半径取为
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d28657e4e9edc2cda57ac248a685faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976f0439b7e85d1f8099fc565b339bf2.png)
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3卷引用:第十一章 立体几何初步 本章小结
2 . 在四边形ABCD中,
,求AC的长以及
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d15ffbd8c8aef4cad2f20ff4f82aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb3db21168da6f06d81d08ebf5b6ee4.png)
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3卷引用:第九章 解三角形 本章小结
3 . 在
中,D是BC的中点,已知
,试判断
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c27b7a6b3b73a348d451792a2aee0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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3卷引用:第九章 解三角形 本章小结
4 . 已知向量
与
的夹角为
,且
,求
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614b003a9f14fed694128f681b2f1d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bdd27628bfa3c687cb9f3f2d32c1f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
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3卷引用:第九章 解三角形 本章小结
5 . 已知
,则下列命题中,是真命题的有哪些?
(1)若
,则
是等腰三角形;
(2)若
,则
是直角三角形;
(3)若
,则
是钝角三角形;
(4)若
,则
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b883d9703a1deaf8dbc18097c6b8bb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397fca77f42d61ad3ff5388cee5bf80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1116215e558396687e4ca6fc8bbabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f751796ea4ad7c937292060d1c113f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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4卷引用:第九章 解三角形 本章小结
6 . 已知
是
的角平分线,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22021ee88f65a1f545dd2159d42b1c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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3卷引用:第九章 解三角形 本章小结
7 . 在
中,已知
.
(1)求
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead4af7dd446bd75d611bcc95dd0729b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c12541267e50469969433b4c14c9a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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3卷引用:第九章 解三角形 本章小结
8 . 如图所示,
为山脚两侧共线的3点,在山顶
处测得3点的俯角分别为
,计划沿直线
开通穿山隧道,为求出隧道
的长度,你认为还需要直接测量出
中哪些线段的长度?根据条件,并把你认为需要测量的线段长度作为已知量,写出计算隧道
长度的运算步骤.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba63ad02b1d5af2982fac3d91eb15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e76c8b3d7b582c047ce6e02ac38b989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/9576b457-128b-45d5-9a4d-480df7bbdfb9.png?resizew=225)
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5卷引用:第九章 解三角形 9.2 正弦定理与余弦定理的应用
(已下线)第九章 解三角形 9.2 正弦定理与余弦定理的应用人教B版(2019) 必修第四册 逆袭之路 第九章 9.2 正弦定理与余弦定理的应用(二)(已下线)11.3 余弦定理、正弦定理的应用人教B版(2019)必修第四册课本习题习题9-2苏教版(2019)必修第二册课本习题 习题11.3
9 . 如图,从高为
的热气球
上测量海平面上
两点之间的距离,现测得
的俯角是
,且
的俯角是
,图中各点都在同一铅垂平面内.用
和
表示出
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12eb814bb12c2e8d3c6de69a73e972ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90448e000c1db19cdaf33f650960effe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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3卷引用:第九章 解三角形 9.2 正弦定理与余弦定理的应用
10 . 如图,在曲柄
绕
点旋转时,活塞
作直线往复运动,设连杆
长为
,曲柄
长
,求曲柄
从初始位置
按顺时针方向旋转
时,活塞
移动的距离
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c56f6c570f673e46dacb99ce139e52ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baf35aca9d4852c0be45bb8c33477d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3411cc31aec1f591278dba83b11e9c7e.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/47f16646a42799ee60b931181b64acdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c9f14bd0-d3b4-47da-9746-e44907472cd3.png?resizew=159)
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3卷引用:第九章 解三角形 9.2 正弦定理与余弦定理的应用