如图,四边形
是矩形,点
,
分别是
,
的中点,连接
,
.
;
(2)若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8f7a3cf5a6acc41c4932eb8548e9e7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3b58a4087b4a569572d93feceaec1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466a12cf2d11494ec4f7173e904932a9.png)
更新时间:2024-04-26 14:27:45
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相似题推荐
解答题-证明题
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【推荐1】八(1)班数学兴趣活动小组的同学们利用课余时间制作了圆柱形容器内径测量仪,如图,制作和使用方法:将两根等长的木棒中心固定在一起,两根木棒可以绕固定点O自由旋转.测量圆柱形容器内径时,把测量仪的一端放入容器内,再将木棒的两端张开,只要测出露在外面的一端两个木棒之间的距离
,就知道了容器的内径
的大小。请你用学过的数学知识解释测量仪的工作原理(写出已知、求证,并证明)
已知:如图,线段
相交于点O,______________,连接
.
求证:____________.
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
已知:如图,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc8849bf90e14f61c4e689702f18096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7958bf505cec48ef1f5412c9ac76b769.png)
求证:____________.
证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/4a71fcd8-c634-4023-a8ed-b92083f8370b.png?resizew=74)
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【推荐2】如图,
,请添加一个条件,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/f419eb75-177b-4ce6-b1b3-4e9cd79469f2.png?resizew=170)
(1)你添加的条件是______(只需添加一个条件);
(2)利用(1)中添加的条件,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14cfd38f667324abf6afe510315c5184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa9ea89b3eeaecb5d1f30f91524c21a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/f419eb75-177b-4ce6-b1b3-4e9cd79469f2.png?resizew=170)
(1)你添加的条件是______(只需添加一个条件);
(2)利用(1)中添加的条件,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa9ea89b3eeaecb5d1f30f91524c21a.png)
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【推荐3】【回归课本】
鲁教版初中数学八上教材第137﹣138页探索并证明了三角形中位线定理这个重要命题,请用文字语言表述三角形中位线定理: .
【回顾证法】
证明三角形中位线定理的方法很多,但多数都要通过添加辅助线构图完成.图2是其中一种辅助线的添加方法.
已知:如图1,
是
的中位线.(请结合图2,补全求证及证明过程)
求证: .
证明:
【实践应用】
如图3,B,C两地被池塘隔开,在没有任何测量工具的情况下,小明通过下面的方法测出了B,C间的距离:先在直线
外选一点A,连接
,
,然后步测出
,
的中点D,E,并测出
的长度为12米,则B,C两点间的距离为 米.
【深入探究】
如图4,DE是
的中位线,
是
边上的中线.
与
是否互相平分?请证明你的结论.
鲁教版初中数学八上教材第137﹣138页探索并证明了三角形中位线定理这个重要命题,请用文字语言表述三角形中位线定理: .
【回顾证法】
证明三角形中位线定理的方法很多,但多数都要通过添加辅助线构图完成.图2是其中一种辅助线的添加方法.
已知:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
求证: .
证明:
【实践应用】
如图3,B,C两地被池塘隔开,在没有任何测量工具的情况下,小明通过下面的方法测出了B,C间的距离:先在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
【深入探究】
如图4,DE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/ed97c3b6-48e9-44f7-b210-c235b4a8cd83.png?resizew=514)
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【推荐1】感知:如图①,在四边形
中,
,
,点P在
边上,当
时,
与
是否相似?______(填“是”或“否”).
探究:如图②,在四边形
中,点P在
边上,当
时,求证:
.
拓展:如图③,在
中,点P是边
的中点,点D、E分别在边
、
上.若
,
,
,则
的长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c5ace226a547e68702df548b08cb5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
探究:如图②,在四边形
![](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/516bcdc180f55d0c66fe19c0712dcaef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ec2ec6cf30c455d67c34e27fe4957c.png)
拓展:如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/e533f54b65f4b2bb4d27002bb0783386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b65d21991c65c735a3d1a502c27cbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e075ad4f-2422-4087-a42e-ddafd24df10b.png?resizew=466)
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【推荐2】如图,AC平分∠BAD,∠DCA=∠CAD,在CD的延长线上截取DE=DA,连接AE.
(1)求证:AB∥CD;
(2)若AE=5,AC=12,求线段CE的长;
(3)在(2)的条件下,若线段CE上有一点P,使△DPA的面积是△ACD面积的六分之一,求PC长.
(1)求证:AB∥CD;
(2)若AE=5,AC=12,求线段CE的长;
(3)在(2)的条件下,若线段CE上有一点P,使△DPA的面积是△ACD面积的六分之一,求PC长.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853031434395648/2854122970972160/STEM/2c5dcf35-54ce-42d0-aedf-a07f2afd3d70.png)
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【推荐1】如图,在
中,
是边
上的中线,过点A作
,过点D作
与
分别交于O、E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/4e46b59c-26c5-41da-8d90-b435fa11cdf8.png?resizew=208)
(1)求证:
.
(2)当
满足什么条件时,四边形
是矩形,并说明理由.
(3)当
满足____________时,四边形
是正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f4169c6415e2241b1fc1ed945b0d8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/4e46b59c-26c5-41da-8d90-b435fa11cdf8.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2292702ebc75724359ed36184438db.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
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【推荐2】在
中,点E在
的延长线上,点F在
的延长线上,连接
,
交
于点G,交
于点H,
.
是平行四边形.
(2)如图2,当点A是
的中点时,请直接写出面积等于
面积的一半的两个三角形和两个四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/9ca9de61128a4d2d33a4c469ec0b26b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](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/4435cb842e4d19929c2070ed0e32201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
(2)如图2,当点A是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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【推荐1】如图1,
是平行四边形
对角线的交点,过点
作
,
,垂足分别为
,
,若
,我们称
是平行四边形
的心距比.
是矩形,
,
,则
________;
(2)如图3,四边形
是平行四边形,
,求证:四边形
是菱形;
(3)如图4,在
中,
,点
、
、
分别在
、
、
边上,若存在一个四边形
是平行四边形,且
,请通过尺规作图作出满足条件的平行四边形
.(不写作法,但要保留作图痕迹;如若有必要,可简述作图思路)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeccd375f7ee16b46cc1f5c22d1995f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a89efb10e95245a41f6c7a80189528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedb5e689848acaef4f537c8d8cbbda1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f78c986be832cbcadf8805d0da0345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
(2)如图3,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d68f2678989a5ce7431cfd51b019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51e114946a52a5621d4e9b73165fa28.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/895dc3dc3a6606ff487a4c4863e18509.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e260f5fe6e3637a415344ff137c7a6be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
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【推荐2】如图①、图②、图③均是3×3的正方形网格,每个小正方形的顶点称为格点,线段
的端点和点P均在格点上.请按要求完成作图,不写作法,保留作图痕迹.
,使其平分线段
,点C在线段
上;
(2)在图②中画一条以P为端点的射线
,使其分线段
为1:3两部分,点D在线段
上;
(3)在图③中画一条以P为端点的射线
,使
,点E在线段
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图②中画一条以P为端点的射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)在图③中画一条以P为端点的射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c357816e3154b98caf72d16328d8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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