解题方法
1 . 赵爽是我国古代数学家,大约在公元222年,他为《周髀算经》一书作序时,介绍了“勾股圆方图”,亦称“赵爽弦图”.(以弦为边长得到的正方形由4个全等的直角三角形再加上中间的一个小正方形组成,如图①),类比“赵爽弦图”,可构造如图②所示的图形,它是由3个全等的三角形与中间一个小等边三角形拼成的一个较大的等边三角形,其中
,则
的值为______ ;设
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bbe0491dc037390ef465b4deef4a20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1412e959d8e97ae6bee534a319662e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e507d3941363e9dbeac8be35134727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
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名校
解题方法
2 . 黄金三角形被誉为“最美三角形”,是较短边与较长边之比为黄金比(即
)的等腰三角形、已知
,
,
的角平分线与边
交于
点,线段
的中垂线过点
,则
的比值为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2027763f44c7a8b25036048fae50b7.png)
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3 . 如图所示,某人在
点测量到远处有一物体在做匀速直线运动,速度为
米/分钟,开始时刻物体位于
点,一分钟后其位置在
点,且
,再过一分钟,该物体位于
点,且
,此时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41541ede19b282b128a198e939a24763.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137dc4d01ecf6bc063ce16d3c644931b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08bb33db35f43dd6ecf399da2e7c24c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41541ede19b282b128a198e939a24763.png)
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解题方法
4 . 已知锐角
内角
,
,
的对边分别为
,
,
若
,
,则
边上高的取值范围为_________ ..
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd5b9bbd3d22bd2cef53dd4b9691257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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5 . 已知
中,角A,B,C所对的边分别为a,b,c,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072373d562d0f5dbb6bd4167c1119eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
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2024-04-28更新
|
395次组卷
|
2卷引用:江苏省南通市如东县2023-2024学年高一下学期期中学情检测数学试卷
6 . 某学校开展“测量故宫角楼高度”的综合实践活动.如图所示,线段
表示角楼的高,C,D,E为三个可供选择的测量点,点B,C在同一水平面内,
与水平面垂直.现设计能计算出角楼高度的测量方案,从以下六组几何量中选择三组进行测量,则可以选择的几何量的编号为________ .(只需写出一种方案)
;④由点D观察点A的仰角
;⑤
和
;⑥
和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
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7 . 如图,为了测量河对岸
,
两点之间的距离,在河岸这边取点
,
,测得
的长为12千米,在点
处测得
,
,在点
处测得
,
.则
,
两点间的距离为______ 千米.(设
,
,
,
四点在同一平面内)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f8939f8c274cb26a8a6a5fa2469087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6af38433c5ea5e25dce0ca0f3919c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6662097cf94dc37facdaba44b49966d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0c6766bd801fa114221d0ab0bfa61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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2024-04-18更新
|
499次组卷
|
2卷引用:江苏省南京师范大学附属中学2023-2024学年高一下学期4月期中考试数学试题
名校
8 . 圣·索菲亚教堂坐落于中国黑龙江省,是一座始建于1907年拜占庭风格的东正教教堂,距今已有114年的历史,为哈尔滨的标志性建筑.其中央主体建筑集球,圆柱,棱柱于一体,极具对称之美,可以让游客从任何角度都能领略它的美.小明同学为了估算索菲亚教堂的高度,在索菲亚教堂的正东方向找到一座建筑物AB,高为
,在它们之间的地面上的点M(B,M,D三点共线)处测得楼顶A,教堂顶C的仰角分别是
和
,在楼顶A处测得塔顶C的仰角为
,则小明估算索菲亚教堂的高度为__________ 米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b30cd312e4887ac43ffce158bba9d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
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2024-04-04更新
|
579次组卷
|
5卷引用:江苏省淮安市马坝高级中学2023-2024学年高一下学期期中考试数学试题
9 . 在
中,内角
对应的边分别为
,已知
.则角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
________ ;若
,则
的值为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e515674b6ac2adfed341715fbfe4a8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047601f113af85e91321b5385dc8edfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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2024高二·全国·专题练习
解题方法
10 . 如图,平面四边形
中,
与
交于点
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b596e35b42cd63d83a861dd9f586b8.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a503772d15eea69d1c8739c6b1c3fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2f554699faf6ebf48d65bcfb5dc15d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b596e35b42cd63d83a861dd9f586b8.png)
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