1 . 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)
您最近一年使用:0次
名校
2 . 【问题提出】
(1)如图1,在矩形
中,
,点E为
的中点,点F在
上,且
,连接
,试判断
是否为等腰直角三角形,并说明理由;
【问题探究】
(2)如图2,在四边形
中,
,连接
,
,点M、N分别为边
的中点,连接
,求线段
的长;
【问题解决】
(3)节能环保日益受到人们的重视,水污染治理工程仍然任重道远.如图3,某工厂有一块四边形工业区
,经测量
,为了方便处理污水,该工厂在边AB上取点E,
上取点F、G(点F在点G的左侧,且E、F、G三点均不与端点重合),使得
,连接
并延长交于点H,在点H处安装一个污水处理设备.根据规划要求,
与
应相等,请问
与
是否相等?并说明理由.
(1)如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb9ed77d586a7976de01e7551cdb23.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/51bb339ba41929e8f693b3618d5ee4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a5734077dda25a1604262ca08e4f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
【问题探究】
(2)如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e5f0fea3b973168542b9b00e10ba6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e73648199da021dfbd260ce162bcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
【问题解决】
(3)节能环保日益受到人们的重视,水污染治理工程仍然任重道远.如图3,某工厂有一块四边形工业区
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae07f2a63edd260923b12437fd1016d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01f2b494eacc3965d82a5b1b0c4ee0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5e616a343dffa178f2368a8ebf2c2bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9c1e0c3cab6b7bb3229221f4310ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9c1e0c3cab6b7bb3229221f4310ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
您最近一年使用:0次
2024-06-04更新
|
156次组卷
|
2卷引用:2024年陕西省汉中市多校联考中考二模数学试题
3 . 如图1,正方形
中,点E是边
上任意一点(不与点B重合),以
为边在它的外侧作正方形
,点M和点P分别是这两个正方形的对称中心,连接
.
时,线段
长的最大值是 ;
(2)在正方形
的边上,是否存在一点Q,使得
为等腰直角三角形?若存在,通过证明确定所有满足条件的点Q的具体位置;若不存在,请说明理由;
(3)如图2.连接
并延长,与
交于点O.求
的度数,并求出
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
(2)在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a9dabb53dc826019fc8b6ae6d940c5.png)
(3)如图2.连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f51d0f39a59c3b7d6d8422c802fee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
名校
4 . 已知正方形
,
是
边上一点,过点
作
交
的延长线于点
,交
的延长线于点
.
,则线段
之间有怎样的数量关系: (直接写出结论);
(2)如图2,如果过点
作
交
的延长线于点
,那么
,请说明理由;
(3)如图3,在(2)的条件下,过点
作
于点
,连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/9bd33dcb66a0a342ec072456dac06659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.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://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1a6e42aa77ba929cb1384211f6e564.png)
(2)如图2,如果过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3f6141b4d267187f855681592b16a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875e60688276eba6b0b9235b43257bbe.png)
(3)如图3,在(2)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f1054e3a5c0fc7dca3d285108112c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bb1b34ba0a8c480f55dad078456663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
您最近一年使用:0次
5 . 如图,
,
是正方形
边
,
上点,
.
至点
,使
,并连接
,求证:
;
(2)在图(2)中,若
,求
值;
(3)在图(1)中,连接
分别交
,
于点
,
,求
的值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.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/345c91c9e67e6ee00a872078ab17f094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c4f440b65c520d479378fa89c1d375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb998001e58d29545efef1e3fd95357.png)
(2)在图(2)中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2d478a257a43d9b28b4105b15e0b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324e464fecd30ea2eef67e934be0f288.png)
(3)在图(1)中,连接
![](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/d004d2d115b477ade6af7ddb93db0df8.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/a3a6f8b9fbd756a58deccb765f2cb77e.png)
您最近一年使用:0次
6 . 数学实验活动:两个正方形纸片的摆放.
将两个边长为
的正方形纸片
、
按图①方式进行摆放后,得到了8个阴影三角形,这些三角形的周长会有怎样的特点呢?数学实验小组经过探究,有了如下3个发现:
;
发现2:将两个正方形按图②方式进行摆放,其中
经过点
,且
与
、
都相交,交点分别为
、
,则图中的阴影三角形(
)的周长是一个定值,请你求出这个值;
发现3:在图②的情形下,按图③方式平移正方形纸片
,使得
分别与
、
相交于点
、
,
分别与
、
相交于点
、
,则图中的2个阴影三角形(
与
)的周长之和也是一个定值,请你求出这个值.
将两个边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
发现2:将两个正方形按图②方式进行摆放,其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/4c105d6ba18fbb0581fb982175e2eac9.png)
发现3:在图②的情形下,按图③方式平移正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/b2f8b3d45ae1743416253d835c054456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
您最近一年使用:0次
名校
7 . 正方形
边长为6,点E是
边上的动点,连接
,交
于点P,过点A作
,交
于点F、Q,过点B作
于点G,交
于点H,连接
.以下说法:①当
时,点F为
的中点;②当
时
;③
;④点E运动过程中,
有最小值6.其中结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c951f0f632fc6054e5e36803971d9be3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26051568b85a51dc567fff9f7acacd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458867e072c713e4e2f35aa5f98b1bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b656465552ff429c513c38d0fe8ab97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154de3fcc24646e247c5be67d39842d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954d2eec976760e7eab41100f2100833.png)
A.①②③ | B.①②④ | C.①③④ | D.①②③④ |
您最近一年使用:0次
8 . 综合与实践
问题情境:
数学兴趣小组在探究与正方形有关的动点问题时,如图2,在正方形内取一点E,使
,将点E绕点C逆时针旋转
得到点
,射线
,
交于点F.
特例研究:
启智小组在探究过程中遵循由特殊到一般的探究规律:如图1,发现点E在对角线
中点O处时,点F与点B重合,此时四边形
的形状为正方形.
探究发现:
(1)博学小组发现,如图2,只要
,四边形
的形状都是正方形,请证明;
(2)奋发小组受博学小组的启发,进一步深入探究,如图3,取
中点G,连接
,
,
,又发现:在点E运动过程中,
与
始终保持特定的数量关系,请写出此数量关系,并说明理由;
拓展应用:
(3)在(2)的条件下,已知
,
,直接写出
的长度.
问题情境:
数学兴趣小组在探究与正方形有关的动点问题时,如图2,在正方形内取一点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864b11496cc738c29a737267cfc07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9d86cfd84294ba79521676570e2d34.png)
特例研究:
启智小组在探究过程中遵循由特殊到一般的探究规律:如图1,发现点E在对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a12a3ce4845a930927a0a229829b86f0.png)
探究发现:
(1)博学小组发现,如图2,只要
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864b11496cc738c29a737267cfc07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a12a3ce4845a930927a0a229829b86f0.png)
(2)奋发小组受博学小组的启发,进一步深入探究,如图3,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a15cb348f1a5626fdd4411906e1a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a15cb348f1a5626fdd4411906e1a32.png)
拓展应用:
(3)在(2)的条件下,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
9 . 如图,在四边形
中,点
,
分别在边
,
上.连接
,
,
,
.
是正方形.
(ⅰ)若
,
,求
的余弦值;
(ⅱ)若
,求证:
是
的中点;
(2)【拓展】如图②,四边形
是直角梯形,
,
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4794cf7c57bdd4825d9e6615e2527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c8599965e62eae0bf34701f1a914a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b02c51ce96d326f33c430cc884ea00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc05fedc31f9f46f04ccfb0d0fdc23f.png)
(ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ad969adb7466b177d9a9cca2de07a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)【拓展】如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7d2a2da5144f0bf6ce091c56b3d5a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88c5025689144c57cf36d1851ebc026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8e620d13e27dbc6d2fe8cf6769eff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
您最近一年使用:0次
2024-04-30更新
|
641次组卷
|
2卷引用:2024年广东省广州市白云区中考一模数学试题
10 . 如图,
是正方形
外一点,连接
交
于点
.连接
,
,且
.
与
之间的数量关系,并说明理由;
(2)求证:
平分
;
(3)如备用图,过点
作
于点
,分别交
,
于点
,
,连接
,若
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a241cddccc81682fbdb0cee24687ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
(3)如备用图,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e45b9efd79e3e9e9101cf0eb98c824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8861f0a5a206281022132864219f34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cbf607284227006fc3b68074ffe31a2.png)
您最近一年使用:0次