如图,在
中,
是直径,点
是
上一点,且
,过点
作
的切线
交
延长线于点
,
为弧
的中点,连接
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2023/1/17/3154859095818240/3155436926492672/STEM/909827b2dbbd4c6683e14604ba231768.png?resizew=180)
(1)求证:
;
(2)已知图中阴影部分面积为6π.
求
的半径
;
直接写出图中阴影部分的周长.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00e0ca93b81029af5c4cd3bbd0314ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73a2ea99756d6f56df681ba489346f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2023/1/17/3154859095818240/3155436926492672/STEM/909827b2dbbd4c6683e14604ba231768.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e87c8c0b4584700f37a23bb32b7a642.png)
(2)已知图中阴影部分面积为6π.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
22-23九年级上·安徽阜阳·期末 查看更多[1]
(已下线)安徽省阜阳市颍州区姜营中学2022-2023学年九年级上学期期末测试数学试卷
更新时间:2023-01-18 13:35:46
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,等边
中,点D、E分别在
、
上,
,连接
、
交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/774689d1-41a4-4a7e-ac64-046b909939cf.png?resizew=404)
(1)求证:
;
(2)点P在
上,连接
、
,
,求证:
平分
;
(3)在(2)的条件下,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/774689d1-41a4-4a7e-ac64-046b909939cf.png?resizew=404)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3334308760163eebfb7fcf1c92cfe604.png)
(2)点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a53367b40238e833504f3f3f7676d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(3)在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968480db1d9797bba9cec76252fd95d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】在
中,点
在
边所在直线上(与点
,
不重合),点
在
边所在直线上,且
,
交
边于点
.
![](https://img.xkw.com/dksih/QBM/2019/7/14/2246854733840384/2248949614723072/STEM/239abcbdd6b243b19ea2fa78f3051186.png?resizew=554)
(1)如图1,若
是等边三角形,点
在
边上,过点
作
于
,试说明:
.
某同学发现可以由以下两种思路解决此问题:
思路一:过点
作
,交
于点
,如图1
因为
是等边三角形,得
是等边三角形
又由
,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
再说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
得出
.
从而得到结论.
思路二:过点
作
,交
的延长线于点
,如图![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5cfdde9c6d1b8bb15b7bb506c30ca8.png)
①请你在“思路一”中的括号内填写理由;
②根据“思路二”的提示,完整写出说明过程;
(2)如图3,若
是等腰直角三角形,
,点
在线段
的延长线上,过点
作
于
,试探究
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2019/7/14/2246854733840384/2248949614723072/STEM/239abcbdd6b243b19ea2fa78f3051186.png?resizew=554)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10809d172017faa4b3bf06c8a61a5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beead354d0b02909363ef897cfca0046.png)
某同学发现可以由以下两种思路解决此问题:
思路一:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49da919805f7e02e7e8f5bcfd8a9d29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ca2e881f27f4ae24999aad28566261.png)
又由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10809d172017faa4b3bf06c8a61a5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e1341e74db1b2b07c7f96b694d42cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
再说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda6015abeecb9792449ec5a1e13e3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
得出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4207f9fbf8d297dd99842b519a23c1d0.png)
从而得到结论.
思路二:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a7ccbd557f988d9ef8e70192ecf11a.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/af5cfdde9c6d1b8bb15b7bb506c30ca8.png)
①请你在“思路一”中的括号内填写理由;
②根据“思路二”的提示,完整写出说明过程;
(2)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790db8e233280bec605fb7b6c3dfb873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】【概念学习】
如果四边形的一条对角线是其中两边的比例中项,则称这个四边形为“闪亮四边形”,这条对角线称为“亮线”,如图1,四边形
中,
满足
,四边形
是闪亮四边形,
是亮线.
【概念理解】
(1)菱形是闪亮四边形,则它的较小的一个内角是 °.
【概念应用】
(2)如图2,四边形
中,
,
, 判断哪一条线段是四边形
的亮线?请你作出判断并说明理由.
(3)如图3,
是闪亮四边形
的唯一亮线,
请求线段
的长.
如果四边形的一条对角线是其中两边的比例中项,则称这个四边形为“闪亮四边形”,这条对角线称为“亮线”,如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4deef6f7135664425801f28e107eab53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae952ca0f954756faad04cb447c06f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
【概念理解】
(1)菱形是闪亮四边形,则它的较小的一个内角是 °.
【概念应用】
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e06f16fa2d417faed687617c2eecfdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffed7dd77a5e0745556b89036334ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48001497183e96bfb16ba4199716c3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c89fac8b35fe3f69906b30dc4ff403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/ae1887c7-51a4-413c-8865-9488ad67888e.jpg?resizew=370)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在四边形
中,对角线
,
交于点
,
,
.
(1)求证:
;
(2)过点A作
,垂足为点
,求证:
;
(3)点
为
上一点,连接
,
,
,
,若
,
,求线段
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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca61f08915e5bd5d9581cb90894e2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed14d6fb4dea3f09c07e562fd9e44e31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/f772dacd-b291-49ed-9a18-5af388ac18e0.jpg?resizew=551)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998cfc1a87900199b4998f6583e209b1.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5fc9e879b2fc4c21241ec16fe4bc181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1e87f3cde853bee7054e3448624736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】在等腰Rt△ABC中,∠BAC=90°,以C为底角顶点再作等腰Rt△CED,使∠CED=90°,连接AD,分别以AB,AD为邻边作平行四边形ABFD,连接AF.
(1)如图1,当点E在AC边上(不与点A、C重合),且D在△ABC外部时,求证:△AEF是等腰直角三角形;
(2)如图2,将图1中△CED绕点C逆时针旋转,当点E落在线段BC上时,连接AE,求证:AF=
AE;
(3)如图3,将△CED绕点C继续逆时针旋转,当平行四边形ABFD为菱形,且△CED在△ABC的下方时,若AB=
,CE=
,求线段AE的长.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718894332911616/2782443426332672/STEM/76fd87c8-833f-491d-a2bb-b8461c342378.png?resizew=550)
(1)如图1,当点E在AC边上(不与点A、C重合),且D在△ABC外部时,求证:△AEF是等腰直角三角形;
(2)如图2,将图1中△CED绕点C逆时针旋转,当点E落在线段BC上时,连接AE,求证:AF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)如图3,将△CED绕点C继续逆时针旋转,当平行四边形ABFD为菱形,且△CED在△ABC的下方时,若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b12efb03327f461e868b2ea433f9b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718894332911616/2782443426332672/STEM/76fd87c8-833f-491d-a2bb-b8461c342378.png?resizew=550)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,AB为⊙O的直径,C是⊙O上一点,过点C的直线交AB的延长线于点D,AE⊥DC,垂足为E,F是AE与⊙O的交点,AC平分∠BAE.
(1)求证:DE是⊙O的切线;
(2)若AE=8,∠D=30°,求图中阴影部分的面积.
(1)求证:DE是⊙O的切线;
(2)若AE=8,∠D=30°,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/251c6438-c3bf-4979-9f84-66f70d8dbbde.png?resizew=162)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,
中,
,
,
,延长
到点D,使
.点P是
边上一点,点Q在射线
上,
,以点P为圆心、PD长为半径作
,交A
于点E,设
.
(1)
______,当点Q在
上时,
______;
(2)x为何值时,
与
相切?
(3)当
时,求阴影部分的面积;
(4)若
与
的三边有两个公共点,直接写出x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab0389bef7fea9fd2429966ef6bf2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f434f74b3dacd3dcefdaed7e98e366c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9334d4bc38bab6fb1bd59e44aacc4964.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/d1b31bb5-538d-4a9e-b5b2-2001398ecf8f.png?resizew=522)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(2)x为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbdc5a132d35551a980fcef4e7ea5b2f.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐1】【阅读理解】
六中珠江中学初三数学学习小组,在做《圆》的课题学习探究时发现:
三角形有五心:重心、外心、内心、垂心、旁心,其中的外心、内心、旁心是我们现在学习的《圆》的“心”.而找“心”所用的工具“垂直平分线”和“角平分线”是8年级学习内容.小组同学做了以下摘要记录
重心:三角形三条中线的交点叫做三角形重心,它是力的平衡点,重心是中线的三等分点.
外心:三角形外接圆的圆心,外心为三角形三边的垂直平分线的交点,外心到三顶点距离相等.
内心:三角形内切圆的圆心,内心为三角形三条内角平分线的交点,内心到三角形三边距离相等.
【实践探究】
(1)已知
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2998ab763026296c102fafd8e9de0fbc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/13294b6c-3d03-4a20-9cbf-79e8b197a4dd.png?resizew=210)
①作出
的角平分线交点
(尺规作图,不写作法,保留作图痕迹);
过
作
,垂足为
(不需尺规作图);
以
为圆心,
为半径作出
的内切圆
②求出
的面积.
③求出内切圆
的半径
的长度.
(2)已知
中,
,
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/64003388-bad6-4f30-b0e7-073c76fe5d8f.png?resizew=210)
①作出
的三边垂直平分线的交点
(尺规作图,不写作法,保留作图痕迹);
连接
;以
为圆心,
为半径作出
的外接圆
②以
为原点,
所在的直线为
轴(点
在点
右方)建立直角坐标系,求点A坐标.
③求出外接圆
的半径
的长度.
六中珠江中学初三数学学习小组,在做《圆》的课题学习探究时发现:
三角形有五心:重心、外心、内心、垂心、旁心,其中的外心、内心、旁心是我们现在学习的《圆》的“心”.而找“心”所用的工具“垂直平分线”和“角平分线”是8年级学习内容.小组同学做了以下摘要记录
重心:三角形三条中线的交点叫做三角形重心,它是力的平衡点,重心是中线的三等分点.
外心:三角形外接圆的圆心,外心为三角形三边的垂直平分线的交点,外心到三顶点距离相等.
内心:三角形内切圆的圆心,内心为三角形三条内角平分线的交点,内心到三角形三边距离相等.
【实践探究】
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6f3d14d4c0d628472a0b5dbd603f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2998ab763026296c102fafd8e9de0fbc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/13294b6c-3d03-4a20-9cbf-79e8b197a4dd.png?resizew=210)
①作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a89efb10e95245a41f6c7a80189528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
③求出内切圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04725e51b4870658f74de79403e3898f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4fc2d383876afe5be1103352571805b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/64003388-bad6-4f30-b0e7-073c76fe5d8f.png?resizew=210)
①作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
③求出外接圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】(1)【特例感知】
如图①,∠ABC是⊙O的圆周角,BC为直径,BD平分∠ABC交⊙O于点D,CD=5,BD=12,则点D到直线BC的距离为 ,点D到直线AB的距离为 .
(2)【类比迁移】
如图②,∠ABC是⊙O的圆周角,BC为⊙O的弦,BD平分∠ABC交⊙O于点D,过点D作DE⊥BC,垂足为E,探索线段AB、BE、BC之间的数量关系,并说明理由.
(3)【问题解决】
如图③,四边形ABCD为⊙O的内接四边形,
,BD平分∠ABC,BD=
,AB=12,则△ABC的内心与外心之间的距离为 .
如图①,∠ABC是⊙O的圆周角,BC为直径,BD平分∠ABC交⊙O于点D,CD=5,BD=12,则点D到直线BC的距离为 ,点D到直线AB的距离为 .
(2)【类比迁移】
如图②,∠ABC是⊙O的圆周角,BC为⊙O的弦,BD平分∠ABC交⊙O于点D,过点D作DE⊥BC,垂足为E,探索线段AB、BE、BC之间的数量关系,并说明理由.
(3)【问题解决】
如图③,四边形ABCD为⊙O的内接四边形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718358dfd51863e2db379726913fb352.png)
![](https://img.xkw.com/dksih/QBM/2022/10/8/3083097213321216/3086598750265344/STEM/7c9ff31949cb4d6ea5732e06ba125bbc.png?resizew=379)
您最近一年使用:0次