现有若干张相同的半圆形纸片,点O是圆心,直径
的长是
,C是半圆弧上的一点(点C与点A、B不重合),连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8332b735710e8ae91d0b2d0a7dfbca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/1a5e5fb4-c07d-47ce-8451-1a06b23c5e72.png?resizew=376)
(1)沿
剪下
,则
是_______三角形(填“锐角”、“直角”或“钝角”);若
,则
______.
(2)分别取半圆弧上的点E、F和直径
上的点G、H.已知剪下的由这四个点顺次连接构成的四边形是一个边长为
的菱形.请用直尺和圆规在图中作出一个符合条件的菱形(保留作图痕迹,不要求写作法);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ff84e2d7f52c7446ef789a54557da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8332b735710e8ae91d0b2d0a7dfbca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/1a5e5fb4-c07d-47ce-8451-1a06b23c5e72.png?resizew=376)
(1)沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f457946f2909889491ba8545d6e5c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5c761662df53eb36fb14c356a721c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72511f149a1b13af02d0e1421d3a63a5.png)
(2)分别取半圆弧上的点E、F和直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb9642339fb644a59a2bef65d21545c.png)
更新时间:2023-12-27 15:05:49
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,菱形
的对角线
,
相交于点O,
且
,连接
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/10/7cd4da1c-af1c-4e31-b9da-22e0d0aea2f6.png?resizew=205)
(1)求证:
(2)若菱形
的边长为4,
,求
的长
![](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/ca14fa885a9d04f04e0418b49b118241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef7a4eac6fdf193c0ed4d8753f64637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/10/7cd4da1c-af1c-4e31-b9da-22e0d0aea2f6.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cede2006bf19da5ae1c126da517ce79c.png)
(2)若菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,四边形
为菱形,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/f87edcca-1070-4f13-93a9-48d5d964e454.png?resizew=216)
(1)直接写出
、
两点坐标;
(2)求经过
、
两点的直线解析式;
(3)画出菱形的中心
,并写出
点的坐标;
(4)把(2)的直线沿着
轴上下平移
,若直线与菱形始终有交点,则直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd4da08956db1f206c8ea026f4e52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc88ea5357b675c01e93c62fea338d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/f87edcca-1070-4f13-93a9-48d5d964e454.png?resizew=216)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)求经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)画出菱形的中心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(4)把(2)的直线沿着
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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解答题-作图题
|
适中
(0.65)
【推荐1】请仅用无刻度直尺完成以下作图.(保留画图痕迹,不写作法)
已知四边形ABCD内接于
,且已知
.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011230691328/2984321861296128/STEM/df3fc76d1da94abea553d117411d6b7f.png?resizew=250)
(1)在图1中已知
,在
上求作一个度数为30°的圆周角;
(2)在图2中,已知
,在
上求作一个度数为30°的圆周角.
已知四边形ABCD内接于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dbf31dfd36aa456a63bafea8bc1985.png)
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011230691328/2984321861296128/STEM/df3fc76d1da94abea553d117411d6b7f.png?resizew=250)
(1)在图1中已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)在图2中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d0ace2fdc833ccc9accc0015380144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在Rt△ABC中,∠ACB=90°,D是边BC上一点,连接AD,△ACD的外接圆⊙O交AB于点E,点F是
上一点,且
,连接AF,DF.
![](https://img.xkw.com/dksih/QBM/2022/3/8/2932059239235584/2961547428397056/STEM/f63550c7b6764f0fb6649a3f6924ef97.png?resizew=164)
(1)求证:∠ADF=∠B;
(2)若AC=4,CB=8,当点E是AB的中点时,求AF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f986c181183d8e7e45655e6c5b5d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0748cf20dfa468ce413071b0375fe8d1.png)
![](https://img.xkw.com/dksih/QBM/2022/3/8/2932059239235584/2961547428397056/STEM/f63550c7b6764f0fb6649a3f6924ef97.png?resizew=164)
(1)求证:∠ADF=∠B;
(2)若AC=4,CB=8,当点E是AB的中点时,求AF的长.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
.
的中点D;
(2)在(1)的条件下,若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d552f3ddc950356df2ee0a5ee2aecc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ff5fcad35756d6bc7b2baa9068ad63.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图所示,在锐角
中,
,
,
所对的边分别是a,b,c,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1501d4035822b34fcc2378f1e316f159.png)
![](https://img.xkw.com/dksih/QBM/2021/9/27/2817215744958464/2817942364422144/STEM/6134f157-f067-4e5d-8a91-61745d82d239.png?resizew=211)
您最近一年使用:0次