如图,
是
的直径,
是
上一点,过
作
的切线交
的延长线于点
,连接
、
,过
作
,交
于
,交
于
.
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234738835808256/3238146965225472/STEM/4b8ca28fef6646658bb59b4e59f8cc5c.png?resizew=184)
(1)求证:
;
(2)若
,
,求
、
的长.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9916e0b16c34ef273cbc64c42dbba5ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234738835808256/3238146965225472/STEM/4b8ca28fef6646658bb59b4e59f8cc5c.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354430653efe54e3f3db09f705bc570c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d552f3ddc950356df2ee0a5ee2aecc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
更新时间:2023-05-15 10:09:46
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,以的边
为直径作
交
于点
,且点
为
的中点,过点
作
于点
,交
的延长线于点
,过点
作
于点
,已知
,
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41ad2cd804093964a64a5736ba35dad.png)
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【推荐2】如图,Rt△ABC中,
,
,以AB为直径作⊙O交AC与点D,过点D的切线交BC于点E.
(2)若
,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953f11eb95bfc036d85b472f81c6fb4e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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【推荐1】
内接于
,直线
与
相切于点D,
与
相交于点E,
.
,求证:
;
(2)如图2,当
是
的直径,点E是
的中点,
时,连接
,求图中阴影部分的面积.
![](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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473e22d0b5ac608506f94cc526dd7a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddf55c1fd82606e7b9e5cf98353106de.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图,在△ABC中,∠C=90°,点E在AB上,以AE为直径的⊙O切BC于点D,连接AD.
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904021752938496/2904729251594240/STEM/f9c0f6c14f7b4e7e8685fc85c31c05c1.png?resizew=157)
(1)求证:AD平分∠BAC;
(2)若⊙O的半径为5,sin∠DAC=
,求BD的长.
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904021752938496/2904729251594240/STEM/f9c0f6c14f7b4e7e8685fc85c31c05c1.png?resizew=157)
(1)求证:AD平分∠BAC;
(2)若⊙O的半径为5,sin∠DAC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
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适中
(0.65)
【推荐1】在
中,
,点
是
的中点,点
是边
上一点,
,交
的延长线于点
,
,交
边于点
,过点
作
,垂足为点
,
分别交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/40c9a3fe-f68e-4d9a-9f86-a15a6bdeb35f.png?resizew=164)
(1)求证:
;
(2)设
,求
关于
的函数关系式及其定义域;
(3)当
是以
为腰的等腰三角形时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4441732c3752283a7c21a070305dd9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9e2a600d4675d510c58b984027e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8635e632f86183e7d7e5225a4bf3782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb023313112cd8a6068d013fdcc9a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41f087d469bc684ea82e2cfd24fb799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14179bef72a820ea868bd8641b28c574.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/40c9a3fe-f68e-4d9a-9f86-a15a6bdeb35f.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab36b86f49e9aed7553cbb185475754.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e0443471e8bc7ea71f75d099fb892f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】已知:如图,在
中,点
,
分别在
,
上,
,
.
(1)写出图中所有与
相似的三角形
(2)如果
,
,
的面积为
,求
面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/96a84ce5-0453-4258-997a-cdc20ee11138.jpg?resizew=133)
(1)写出图中所有与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb33c6c711259d843f3c3d7ae5f5cd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30f2ee280b93cdeb3bcbfa7af980fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d9da98941554fbe8c8ee5270cd0989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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真题
【推荐3】△ABC中,AB=AC,D为BC的中点,以D为顶点作∠MDN=∠B,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/cb78711d-3544-4730-bba8-d0fc124c4891.png?resizew=363)
(1)如图(1)当射线DN经过点A时,DM交AC边于点E,不添加辅助线,写出图中所有与△ADE相似的三角形.
(2)如图(2),将∠MDN绕点D沿逆时针方向旋转,DM,DN分别交线段AC,AB于E,F点(点E与点A不重合),不添加辅助线,写出图中所有的相似三角形,并证明你的结论.
(3)在图(2)中,若AB=AC=10,BC=12,当△DEF的面积等于△ABC的面积的
时,求线段EF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/cb78711d-3544-4730-bba8-d0fc124c4891.png?resizew=363)
(1)如图(1)当射线DN经过点A时,DM交AC边于点E,不添加辅助线,写出图中所有与△ADE相似的三角形.
(2)如图(2),将∠MDN绕点D沿逆时针方向旋转,DM,DN分别交线段AC,AB于E,F点(点E与点A不重合),不添加辅助线,写出图中所有的相似三角形,并证明你的结论.
(3)在图(2)中,若AB=AC=10,BC=12,当△DEF的面积等于△ABC的面积的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af46237d7279ffb682d57e4e7b57a2b.png)
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【推荐1】如图,点
在
上,
,交
于点
,点
为射线
上一动点,
平分
,连接
.
(1)求证:
;
(2)连接
,若
,则当
_______时,四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acc0628dabbbaa929b7437021cad8a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdab863f0a20477d3763e30dd5b432d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7081d946f30dfbf670430adb62f4f0.png)
![](https://img.xkw.com/dksih/QBM/2020/2/23/2405370260168704/2406179682254848/STEM/22fb3574-29b5-49ad-be2b-b299f2e1c345.png)
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【推荐2】如图是一个量角器和一个含30°角的直角三角板放置在一起的示意图,其中点B在半圆O的直径DE的延长线上,AB切半圆O于点F,且BC=OE.
![](https://img.xkw.com/dksih/QBM/2016/4/21/1574196153466880/1574196159381504/STEM/7efa0a00c26642aa9fcbb3dadbf18621.png)
(1)求证:DE∥CF;
(2)当OE=2时,若以O,B,F为顶点的三角形与△ABC相似,求OB的长;
(3)若OE=2,移动三角板ABC且使AB边始终与半圆O相切,直角顶点B在直径DE的延长线上移动,求出点B移动的最大距离.
![](https://img.xkw.com/dksih/QBM/2016/4/21/1574196153466880/1574196159381504/STEM/7efa0a00c26642aa9fcbb3dadbf18621.png)
(1)求证:DE∥CF;
(2)当OE=2时,若以O,B,F为顶点的三角形与△ABC相似,求OB的长;
(3)若OE=2,移动三角板ABC且使AB边始终与半圆O相切,直角顶点B在直径DE的延长线上移动,求出点B移动的最大距离.
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