如图,
为
的直径,
是
的切线,切点为B,
平行于弦
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/a3bde8af-6634-408c-b2cc-3a69078f7a96.png?resizew=135)
(1)求证:
是
的切线;
(2)已知直线
与
交于点F,且
,
,求
的半径.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/a3bde8af-6634-408c-b2cc-3a69078f7a96.png?resizew=135)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb94acdc3de00655e6e29d5372da09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2024-03-06 09:04:19
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知:两个等腰直角三角板△ACB和△DCE(AC=BC,DC=CE,∠ACB=∠DCE=90°)如图所示摆放,连接AE、BD交于点O.AE与DC交于点M,BD与AC交于点N.
![](https://img.xkw.com/dksih/QBM/2021/8/24/2792825595084800/2794017724112896/STEM/ca8e58094bcd4c6481be5a4cc18ea827.png?resizew=422)
(1)如图1(两个等腰直角三角板大小不等),试判断AE与BD有何关系并说明理由;
(2)如图2(两个等腰直角三角板大小相等,即AC=DC),在不添加任何辅助线的情况,请直接写出图2中四对全等的直角三角形.
![](https://img.xkw.com/dksih/QBM/2021/8/24/2792825595084800/2794017724112896/STEM/ca8e58094bcd4c6481be5a4cc18ea827.png?resizew=422)
(1)如图1(两个等腰直角三角板大小不等),试判断AE与BD有何关系并说明理由;
(2)如图2(两个等腰直角三角板大小相等,即AC=DC),在不添加任何辅助线的情况,请直接写出图2中四对全等的直角三角形.
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【推荐2】规定:顶角相等且顶角顶点重合的两个等腰三角形互为“兄弟三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/f25fe512-0220-437e-b03d-0ffa8be879ca.png?resizew=362)
(1)如图①,在
与
中,
,当
、满足条件____时,
与
互为“兄弟三角形”;
(2)如图②,在
与
互为“兄弟三角形”,
,
相交于点M,连
,求证:
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2884b46c0b3b258154b393777e966a.png)
(3)如图③,在四边形
中,
,
,
,求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/f25fe512-0220-437e-b03d-0ffa8be879ca.png?resizew=362)
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097c597306f9afb16ba87cbedf8e35a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75e2eaf6394f3b07703e4176541b7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2884b46c0b3b258154b393777e966a.png)
(3)如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b648f6f2bcc33d4ab0d3925ffb9c5e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e47acfa0b0bde7dbb8d7f294f98185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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【推荐1】如图①,在正方形
中,
,点
、
分别在
、
上,
,试探究
尽面积的最小值.下面是小丽的探究过程
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/e6fd5469-8424-44da-adf6-c53dce072388.png?resizew=336)
(1)延长
至
使
;连接
,可以证明
,请完成她的证明.
(2)设
,
,
.
①结合(1)中的结论,通过计算得到
与
的部分对应值.请写出表格中
的值;
写出解答过程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ef244e9cd295656496929fbb46a9a5.png)
②利用上表和(1)中的结论通过描点、连线可以分别画出函数
、
的图象.请在图②中完善她的画图;
(3)根据以上探究,估计
面积的最小值约为______
结果怙计到
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77847ba0afc18466b17cea483eb29cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3da274149cb4230caa5e3624152666.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15347d7870120325031b981affdac48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/e6fd5469-8424-44da-adf6-c53dce072388.png?resizew=336)
(1)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21002725043bdace95b3244d4c75dd74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e94b7eca12a2bde607733be9a7d268e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef173e640465fab2f68d1b3865a2357.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0a179491094a0b4fd4b04cbd99b2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1371cc17a626029646edf378dafccb3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d11c62bb3880739a5b28f11f37775463.png)
①结合(1)中的结论,通过计算得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81968aa7eaa2f1c6294435ae72ebc11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de629ae869e25cbd394121fc990d2f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ef244e9cd295656496929fbb46a9a5.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81968aa7eaa2f1c6294435ae72ebc11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdf7aaf44733c758606ff325047ab1e.png)
(3)根据以上探究,估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15347d7870120325031b981affdac48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de629ae869e25cbd394121fc990d2f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60fa757cc110b9f8fcf1fe499894e592.png)
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【推荐2】如图,四边形
是
的内接四边形,
为直径,点D为弧
的中点,连接
.延长
交于点E,
为
的切线.
平分
;
(2)若
求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d120e0e81c35e8624db61e080d2245ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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名校
【推荐1】如图,
内接于
,BD为
直径,弦AD交BC于点E,过点B作
的切线交DA的延长线于点F,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/2330c243-a820-4cbd-8021-e6acd63fa417.png?resizew=205)
(1)求证:
;
(2)若
,
,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996b89406a816744a88614265ff4b26b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/2330c243-a820-4cbd-8021-e6acd63fa417.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613dedf2d90e58591b7ac4a250ac7b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/161b01f1bf8adaa139234465f48514a5.png)
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【推荐2】如图,AB为
的直径,弦CD⊥AB,点E为
的中点,CE交AB于点F,CE的延长线交过点A的切线于点P,连接AE.
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989015472824320/2991226303324160/STEM/65faa76d-4be6-4f5a-9110-e19177377f91.png?resizew=192)
(1)求证:AE=EF;
(2)连接AD交CE于点M,若AB=5,EF=3,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989015472824320/2991226303324160/STEM/65faa76d-4be6-4f5a-9110-e19177377f91.png?resizew=192)
(1)求证:AE=EF;
(2)连接AD交CE于点M,若AB=5,EF=3,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa696af3888ebe5a416f472266db26b2.png)
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【推荐1】已知抛物线y=ax2+bx+c(a≠0)经过A(-2,0)、B(0,1)两点,且对称轴是y轴.经过点C(0,2)的直线l与x轴平行,O为坐标原点,P、Q为抛物线y=ax2+bx+c(a≠0)上的两动点.
![](https://img.xkw.com/dksih/QBM/2012/2/21/1573341881204736/1573341897670656/STEM/7f4f53366d184ea4a4e799b79d889fa4.png?resizew=177)
(1) 求抛物线的解析式;
(2) 以点P为圆心,PO为半径的圆记为⊙P,判断直线l与⊙P的位置关系,并证明你的结论;
(3) 设线段PQ=9,G是PQ的中点,求点G到直线l距离的最小值.
![](https://img.xkw.com/dksih/QBM/2012/2/21/1573341881204736/1573341897670656/STEM/7f4f53366d184ea4a4e799b79d889fa4.png?resizew=177)
(1) 求抛物线的解析式;
(2) 以点P为圆心,PO为半径的圆记为⊙P,判断直线l与⊙P的位置关系,并证明你的结论;
(3) 设线段PQ=9,G是PQ的中点,求点G到直线l距离的最小值.
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【推荐2】如图,AB为⊙O的直径,C、D为⊙O上不同于A、B的两点,∠ABD=2∠BAC,过点C作CE⊥DB交DB的延长线于点E,直线AB与CE交于点F.
(1)求证:CF为⊙O的切线;
(2)填空:
①若AB=4,当OB=BF时,BE=______;
②当∠CAB的度数为______时,四边形ACFD是菱形.
(1)求证:CF为⊙O的切线;
(2)填空:
①若AB=4,当OB=BF时,BE=______;
②当∠CAB的度数为______时,四边形ACFD是菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/81ba5656-7c36-4b0a-9087-be7bd9cfdd35.png?resizew=188)
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