1 . 如图,在每个小正方形的边长为1的网格中,等腰直角三角形
的顶点A在格点上,
,以
为直径的半圆与边
的交点D在网格线上.
的值等于______________ ;
(2)若P为边
上的动点,当.
取得最小值时,请用无刻度 的直尺,在如图所示的网格中,画出点P,并简要说明点P的位置是如何找到的(不要求证明)______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.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/de7219026fd98e1c564f20bd0416d909.png)
(2)若P为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882bf0ddacdb7b85d1eb7a8233c419e6.png)
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2 . 凡奥贝尔定理是数学中的一个重要定理,凡·奥贝尔(
)是19世纪的一位德国数学家和工程师,他在数学和工程领域做出了多项贡献.其中,他提出了一个关于四边形和正方形的定理,即凡·奥贝尔定理.该定理指出,在任意一个四边形中,如果在其边外侧构造一个正方形,并将相对的正方形的中心连起,那么这两条线段将相等且互相垂直.如图1,以四边形
的边为边向外作四个正方形,四边形
,四边形
,四边形
,四边形
,
与
相交于点R,
与
相交于点N,其中心分别为
,连接
相交于点P,证明:
.
证明过程如下:
连接
,取
的中点M,连接
,
四边形
,四边形
是正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4c03ac696b191d126d6b132e0c90c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff2fc3ba6d7be43f7671e82b63ba804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f3e808b4bfc547d0d12c48de35bac8.png)
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad3b3c475c17284960f06d8cabc1a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce4b1cedfe1c9185649c5f3fff306d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d261c4c1c07e98549d37b86b33e7e4d4.png)
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1220ede200807d00ea98cfaaaa77f6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1ed1b2babf31b5c17f8ea9ec8080e4.png)
为
的中点,M为
的中点
(依据①)
同理![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddaabf0e291e9efa5d0012eedd3c9572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aff148fdad97d3ba3e225aa26df1f08.png)
同理可得:____________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dd4ab270bd906f7632f9cf6f437964.png)
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f5f7bd27e76524de14ba22182eb696.png)
……
(2)按照上面的思路,完成该定理的证明的剩余部分
(3)已知
,分别
,
,
为边向外作正方形
,
,
,点
分别是正方形
,
,
的对角线交点,连接
其中
,则四边形
的面积为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff9c41edc7935a8123841760cd4f1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea61ea3f3cf0e3001a5094960e9dc11f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca26dc1e9f90310e08150d5783e7e85f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593e424d96f343e77e0c3cec6e84cb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97607f6947b43d1847bb9db1b1c59615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97607f6947b43d1847bb9db1b1c59615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2218a80f8c5c7880090aafb28c760a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1deff46dc9e1c3e23425b6c12d15c4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6694610539184a9f651ff6623df8af8.png)
证明过程如下:
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd16f20bf90e92d19233cc17d0a51dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593e424d96f343e77e0c3cec6e84cb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4c03ac696b191d126d6b132e0c90c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff2fc3ba6d7be43f7671e82b63ba804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f3e808b4bfc547d0d12c48de35bac8.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adf6b0baefbfee5e95031bf45b4c384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592849d99e570c23906687097b1072ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad3b3c475c17284960f06d8cabc1a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce4b1cedfe1c9185649c5f3fff306d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d261c4c1c07e98549d37b86b33e7e4d4.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7900f73cd8362506f6b5575e1630f19e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b67a52161d2d254d84bd5e6c15092a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1220ede200807d00ea98cfaaaa77f6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1ed1b2babf31b5c17f8ea9ec8080e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5495a560dda56c5727157c6044d0f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38113a856f2b1f61581a16d52f03303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3a6e80700975a96ae8c381a17856b9.png)
同理
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddaabf0e291e9efa5d0012eedd3c9572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aff148fdad97d3ba3e225aa26df1f08.png)
同理可得:____________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dd4ab270bd906f7632f9cf6f437964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a12522642eb592215a5d0bf1419cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f5f7bd27e76524de14ba22182eb696.png)
……
(2)按照上面的思路,完成该定理的证明的剩余部分
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0da522aef3c452767df89b8d0eb62de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bf4f4d7ba01c1d6f7ecf75d4fd3129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fd4dfee3258dc4e386330bac4ef0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0da522aef3c452767df89b8d0eb62de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bf4f4d7ba01c1d6f7ecf75d4fd3129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430fa053e134f78498bbb90fd34222ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e9ecc7d7615d7fd72b7d071f008a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c70ad35e24ec145da3f7be97dcb25d.png)
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3 . 【课本再现】“直角三角形斜边上的中线等于斜边的一半”是直角三角形的一条重要性质定理.如图1,在
中,
,点D是
的中点.求证:
.
下面是两位同学两种添加辅助线的方法:
小明:如图2,延长
至点E,使
,连接
;
小华:如图3,取
的中点E,连接
;
(1)请你选择其中一位同学的方法完成证明,聪明的你也可以利用图1用其他方法完成证明.
中,
是高,求证:B,C,D,E四点共圆.
【拓展提升】(3)如图5,在五边形
中,
,
,F为
的中点,求证:
.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
下面是两位同学两种添加辅助线的方法:
小明:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba87bb6ab3a88f6d9529e01ce585a5d.png)
小华:如图3,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)请你选择其中一位同学的方法完成证明,聪明的你也可以利用图1用其他方法完成证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
【拓展提升】(3)如图5,在五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766ae8acaddb28f8a5a55eff086fd976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd34a9d150aff3aa789230d7772384a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193ea44749f1c64c8723e84a57d15cb9.png)
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4 . 【教材呈现】如图,在
中,点D、E分别是
与
的中点.则
与
的关系是
,
;
中,点O为
的中点,点M为
边上一动点,点N为
的中点,连结
、
、
.
,
与
的数量关系是____________.
【应用】如图2,在
中,
,
,
、
是
的中线,M、N分别是
和
的中点,求
的长;
【拓展】如图3,在平行四边形
中,点E为
边上一点,连接
,点P在
上,
,点G是
的中点,连接
交
于点F,若点F为
的中点,
,连接
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ce32435647d7324b3c40a3fa758fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98e38cebc8600ba35288258fdfe462a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244bba070922ceddf4ce3d7ec15c40ec.png)
【应用】如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
【拓展】如图3,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/0cc7e41b23315231032d849b857fb904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48154acabd6b265753a4adb012f2ead9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0a538a73dd30cfcb47455e37bfb4cc.png)
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5 . 小东在学习过程中,注重知识的迁移和延伸,下面是他在“图形的旋转”主题下设计的问题,请你解答.
如图1,在
中,
,
,点
是
边上一动点(不与点
,
重合),连接
,将线段
绕点
逆时针旋转
,得到线段
,连接
,
,则
______;若点
,
分别是
,
的中点,则
,
之间的数量关系为_____.
(2)迁移应用
如图2,在
中,
,
,
于点
,点
是线段
上一动点(不与点
,
重合),将线段
绕点
顺时针旋转
,得到线段
.点
在线段
上,且
.猜想
,
之间的位置关系,并就图2所示的情形给出证明.
(3)问题解决
在(2)的条件下,若
,
,当
是直角三角形时,请直接写出
的长.
如图1,在
![](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/cb2cf0e95fdf1fd8a5b01d3dfd905e08.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b753dbb5a670dd4f5e23bb919e44dda2.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)迁移应用
如图2,在
![](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/2883e8d5eb46991be74fa91633aa65d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.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/9d78abbad68bbbf12af10cd40ef4c353.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad23bcc6b917fb9c1c3c9fde2ecc9bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697f330cacd90cc2f0822864e701db8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(3)问题解决
在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
6 . 如图
,
和
都是等腰直角三角形,且
,
,
.
绕着点
逆时针旋转,连接
.
时,求
的长;
(2)如图
,若
、
、
分别是
、
,
的中点,连接
、
,试猜想
与
的关系,并证明你的猜想:
(3)如图
,在旋转过程中,连接
、
,当
有最大值时,把
沿着
翻折到与
同一平面内得到
,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3532d491a3cf0949e944b7f9ebd2be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57fc21aa4e502abb321692bd2c0238a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0117046e7a37bebe0c7b987a00d2bcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f322a20cf86e6e40613de6459ec6b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d4f672ce1168523c1fb0c967af7cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3224e02ba567cf25cd7c361c7dfc6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d011d6ad89d0b033f96c2efbb314d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b05d6899d398fa4202a751d4c8981.png)
您最近一年使用:0次
2024·新疆乌鲁木齐·三模
7 . 如图,在
中,
,
,点
为
边上一动点
不与点
、
重合
,
垂直
交
于点
,垂足为点
,连接
并延长交
于点
,
①若
是
边上的中线,则
;
②若
平分
,则
;
③若
,则
;
④
的最小值为
.
上面结论正确的序号是______ .
![](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/209acf15985d1ea1ad86fc4a37e38c0b.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/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52049ee1e693213da40acf6d079a28d4.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709f4a8deb00322ca93ed34e3570f559.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d78524f98b01fa1dadfd277939665b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8408cdf53667cef5c76fb3a2cec99e5c.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f322feb3814b978ac74168d97eb1ccd9.png)
上面结论正确的序号是
您最近一年使用:0次
8 . 如图.已知
为等腰直角三角形,
,
、
分别为
、
上的两点,
,连接
,将
绕点
逆时针旋转
得
,连接
与
交于点
.
时,若
,求
的长;
(2)如图2,连接
,
为
的中点,连接
,求证:
;
(3)如图3,连接
,将
绕点
顺时针旋转
得
,连接
、
、
,若
,当
周长取得最小值时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e959e2f211cd4c6bc6ad772251241bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f43672e447170a07f44be5c5a08811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c5e57599c26885f7ce321e567cada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b795a5f054242e85b105083f7aacb5.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1b68f13fed987f5209197de7bc8b4.png)
您最近一年使用:0次
9 . 顺次联结一个四边形各边中点,所得的四边形是矩形,那么这个四边形是( )
A.矩形 | B.正方形 |
C.菱形 | D.对角线互相垂直的四边形 |
您最近一年使用:0次
10 . 如图是由小正方形组成的
网格,每个小正方形的顶点叫做格点,
中,A是格线上的点,仅用无刻度的直尺在给定网格中完成画图.
的中点M;将
沿着
方向平移至
;
(2)在图(2)中,将线段
绕C逆时针旋转
至
(点E为点B的对应点);过点E作
于F.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c74b9fbb22fa03895d47df82702a8841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)在图(2)中,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
您最近一年使用:0次
2024-03-31更新
|
227次组卷
|
4卷引用:2024年湖北省武汉市江汉区中考一模数学试题