如图,
和
是有公共顶点的直角三角形,
,点
为射线
,
的交点.
和
是等腰三角形,求证:
;
(2)如图2,若
,问:(1)中的结论是否成立?请说明理由.
(3)在(1)的条件下,
,
,若把
绕点A旋转,当
时,请直接写出
的长度.
![](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/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](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/571ffae2f77df57a8e121fdb1ec02bb5.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8958c0563f1924b6f7cc9bc8555a8178.png)
(3)在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c65319e9026d1db4d468f69fd8f9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
更新时间:2024-02-15 20:54:43
|
相似题推荐
解答题-证明题
|
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(0.4)
名校
【推荐1】如图,在
中,
.
.点
在
上,点
在
上.
.点
在
延长线上,连接
、
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/4ace3ee4-243c-40ee-8ad3-38acecedd24e.png?resizew=439)
(1)求证:
;
(2)求
的值(用含
的式子表示);
(3)如图2,延长
,交
于点
,若
.求
的值(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f162db80bc14f3a155b9c7a6fa27c4d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b3ee2503f76ec42fbeddc437fc30d4.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a423dc5385b9af3fb0c46f52171a4494.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/4ace3ee4-243c-40ee-8ad3-38acecedd24e.png?resizew=439)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9ea0a68a9fd68ae73ff11fd6e1e2d5.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162a63a843fbab248c9c897c03a4a3eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de34ebe2e2b6d60e7e46b995f2951668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff366cacf1f5b3ef163a37f275581811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】如图,
是等腰直角三角形,
,点D,E,F分别在
边上,
,
的延长线与
的延长线相交于点G.
![](https://img.xkw.com/dksih/QBM/2023/3/19/3197985256136704/3198864962691072/STEM/a37bd8e2021b44f8a8cb0053577dc545.png?resizew=305)
(1)不添加辅助线,在图中找出一个与
相似的三角形(不需证明);
(2)若
,求
的长;
(3)若
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633ac971ea83bf9dfc1fc441a3b0030f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae217fb5c8b6b71c7021e2ea47ea4d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2023/3/19/3197985256136704/3198864962691072/STEM/a37bd8e2021b44f8a8cb0053577dc545.png?resizew=305)
(1)不添加辅助线,在图中找出一个与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a00c0cff70cac427278a2b566eb2ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cdd8ef43e2c451d203d79d5aeb376d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92c6fa1d6520a2782d57b701d04a1b.png)
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【推荐1】如图,
为⊙
的直径,
为弦
的中点,连接
并延长,交弧
于点
,过点
作⊙
的切线,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/ee066aa1-fb0d-48ed-83e2-86fd61c6b4bf.png?resizew=180)
(1)求证:AC∥DE;
(2)连接
、
、
.填空
①当
的度数为___________时,四边形
为菱形;
②当
时,四边形
的面积为___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/ee066aa1-fb0d-48ed-83e2-86fd61c6b4bf.png?resizew=180)
(1)求证:AC∥DE;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a037c23a11c7783b1b44988c21634f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8735e2de0ec29640d1eff9e043556030.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9463a829d3abf7935bc072d6a894d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
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【推荐2】如图,在△ABC中,∠ACB=90°,AC=6cm,BC=8cm,动点P从点C出发,按C→B→A的路径,以2cm每秒的速度运动,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/12d95345-f904-4fdf-b987-0c7a89df3416.png?resizew=470)
(1)当t=1s时,求△ACP的面积.
(2)t为何值时,线段AP是∠CAB的平分线?
(3)请利用备用图2继续探索:当△ACP是等腰三角形时,求t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/12d95345-f904-4fdf-b987-0c7a89df3416.png?resizew=470)
(1)当t=1s时,求△ACP的面积.
(2)t为何值时,线段AP是∠CAB的平分线?
(3)请利用备用图2继续探索:当△ACP是等腰三角形时,求t的值.
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【推荐1】在
中,
,
,
.点
在
边上且
,将
绕点
逆时针旋转
得到
.
时,求
;
(2)如图2,在旋转过程中,连接
,取
中点
,作射线
交直线
于点
.求线段
的取值范围;
(3)如图3.当
时,点
为线段
上一动点,过点
作
射线
于点
,
为
中点,直接写出
的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bed0f389cb050935b1a85706d30cd4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac323e557203bc46309021550f9f692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc021403a213099461f475f308b5d3ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f291575950d5a6b73815a528246054f8.png)
(2)如图2,在旋转过程中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)如图3.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc021403a213099461f475f308b5d3ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53569e6ec795658b4fffcddeebe0f142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77e9c89b7275b0c1a9af5c9a72e5968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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【推荐2】如图,在
中,
,
,点
是边
所在直线上的一个动点,连接
,将
绕点
按逆时针方向旋转
得到
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/a3869d47-d9cb-4544-ae4e-df181c83e821.png?resizew=480)
(1)如图1,当点
在
的延长线上时,求证:
.
(2)如图2,若点
从点
运动到点A.
①
的周长是否存在最小值,若存在,求出最小值,若不存在,请说明理由.
②如图3,过点
作
的垂线,与直线
交于点
,作点
关于直线
的对称点
,直线
交直线
于点
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ef20fa326183dc9cf2a62d541030c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/a3869d47-d9cb-4544-ae4e-df181c83e821.png?resizew=480)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a9f49a7c376a6dea7ebcdb42cce2df.png)
②如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f176ea7b53279ae48377dd913d8ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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名校
【推荐1】如图,已知
是
的弦,点
、
是
上的两个点,
交
于点
,连结
,
.
是
的中点.
(2)若
,求
的值.
(3)若
,则
的值是否为定值?如果是,请求出其值;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c3f982d999937891eec4cb22d62e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4e0319de95ba176be869b47d273149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32577573853a4593011143e3c63f1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81246196eff78f9b6791b4d538e7866.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】等腰直角△AOB和等腰直角△COD按如图方式放置,∠AOB=∠COD=90°,连接AC、BD,二者交于点P.
(1)求证:BD=AC;
(2)连接OP,若OP平分∠AOD,且角∠AOD=40°,求∠BDO的度数;
(3)点M、N分别是AB、CD的中点,连接MN,求
的值.
(1)求证:BD=AC;
(2)连接OP,若OP平分∠AOD,且角∠AOD=40°,求∠BDO的度数;
(3)点M、N分别是AB、CD的中点,连接MN,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2044b01c3e9f0bdece72ad17bdfd886d.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712424568225792/2750597850038272/STEM/294c1790-cef8-42f6-ad87-5fa746b58835.png?resizew=171)
您最近一年使用:0次