如图,在△ABC中,AB=BC,以AB为直径的半圆O交AC于点D,过点D作DE∥AB交BC于点E,连接OD,OE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/9a38d416-fec7-49fb-8f1f-69d2b111629f.png?resizew=191)
(1)求证:OE=
AC;
(2)填空:
①当∠A=________°时,四边形AOED是菱形;
②当∠A=________°时,四边形OBED的面积最大.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/9a38d416-fec7-49fb-8f1f-69d2b111629f.png?resizew=191)
(1)求证:OE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)填空:
①当∠A=________°时,四边形AOED是菱形;
②当∠A=________°时,四边形OBED的面积最大.
更新时间:2022-05-23 11:36:54
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,AE是正方形ABCD中∠BAC的角平分线,AE分别交BD、BC于点F、E,AC与BD交于点O,求证:OF=
CE
![](https://img.xkw.com/dksih/QBM/2014/4/24/1573721636560896/1573721642934272/STEM/1cb4d7156ad34471b8a8eab75798edff.png)
![](https://img.xkw.com/dksih/QBM/2014/4/24/1573721636560896/1573721642934272/STEM/0bcdf7a123214b62b342e8071a73fae1.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,已知,在
中,
,点B是
的中点,过点D作
,
,连接
.
(1)求证:四边形
是菱形;
(2)若
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9526f611f29865be579598fd31e2fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aeb7d8bfd4877a9bd85b7cc69aec40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/668483e8-3940-4d25-ace9-8d427048bbd1.png?resizew=176)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1683873d45d4bc8eadf70ba4ca6d8b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee204ff79fe9e039f2e49c08f0079cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1683873d45d4bc8eadf70ba4ca6d8b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,在
中,求作菱形
,使其面积等于
的面积的一半,且点E,F,G,H分别在边
,
,
,
上.
(1)小明所作的四边形
是菱形吗?为什么?
(2)四边形
的面积等于
的面积的一半吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
小明的作法 ①如图2,连接 ![]() ![]() ②过点O作直线 ![]() ![]() ![]() ③过点O作l的垂线,分别交 ![]() ![]() ④连接 ![]() ![]() |
(1)小明所作的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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,在平行四边形ABCD中,点G在CD上,点H在AB上,且DG=BH,点E.F在AC上,且AE=CF.连接GF,FH,HE,EG.
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526385964490752/2526477178347520/STEM/f6685cf9710c4c64be4d150cfbdd73ab.png?resizew=161)
(1)求证:△CFG≌△AEH;
(2)若AG=GC,则四边形EHFG是什么特殊四边形?请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526385964490752/2526477178347520/STEM/f6685cf9710c4c64be4d150cfbdd73ab.png?resizew=161)
(1)求证:△CFG≌△AEH;
(2)若AG=GC,则四边形EHFG是什么特殊四边形?请说明理由.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
,点D是
的中点,以
为直径作
,与
交于点E,过点E作
的切线
,交
于点F.
(1)求证:
;
(2)若
的半径是
,
,求
的长.
![](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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/80d74d8a-abd2-4d45-a87b-1751d357ff0d.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5d3b215f71b490fa51131793f1402a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.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,点
是以
为直径的
上一个动点,
为
的切线,并交
延长线于点
,作
交
于点
,连接BM,OC.
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461467648/STEM/eedf1591-f7d1-49d9-b977-f2adc200f4e0.png?resizew=224)
(1)求证![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8be09a3f925392dd49e2e0fd11a048a.png)
(2)若
,填空:
①连接OM,BC,当
时,四边形
为菱形;
②当
时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/9d78abbad68bbbf12af10cd40ef4c353.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d9aaf34297678a3fdd71201a74a9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461467648/STEM/eedf1591-f7d1-49d9-b977-f2adc200f4e0.png?resizew=224)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8be09a3f925392dd49e2e0fd11a048a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
①连接OM,BC,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e9b0c893953fc0db41a2ed2d801ff6.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749f08f245d16494e1531174879ca667.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】(1)解不等式
.
(2)如图,在
中,D、E在边
上,
,
,
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e07f7a823cd6e833533cf0e1a19bf20.png)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】在平面直角坐标中,OA=4,OB=8,直线y=﹣2x+b交x轴和y轴于点D、E.
(1)求直线AB的解析式;
(2)若
=
,试求b的值;
(3)若
=
,求b的值.
(1)求直线AB的解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e210703c4c8b547f0dd3645096a1ff19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2020/10/7/2565672552792064/2566049970462720/STEM/7862bb880fe940a3b7bed6912601fadf.png?resizew=193)
您最近一年使用:0次