如图,已知点A,D,B,E在同一条直线上,
,
,
.
(1)求证:
:
(2)判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c226581e14091779321c9fe91160ceef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/b933f80b-88c1-415c-b335-98c8ad7d2215.png?resizew=224)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1323c31873c713818327c88340d2d1c2.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafabd077934109c38255fa6d3a8bb60.png)
更新时间:2023-12-09 20:32:17
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【推荐1】如图,△ABC中,AD平分∠BAC,AD也是BC边上的中线,过点D作
,垂足为点E垂足为点F.
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951517503651840/2953094848225280/STEM/1ffd0ff5-4df5-440d-b0a6-99ca6f21ae98.png?resizew=126)
(1)请用全等符号直接写出图中所有的全等三角形;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951517503651840/2953094848225280/STEM/1ffd0ff5-4df5-440d-b0a6-99ca6f21ae98.png?resizew=126)
(1)请用全等符号直接写出图中所有的全等三角形;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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【推荐2】已知
中,
,
,
为
边上一点,过
点的直线交
及
延长线于
、
两点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/b7bcf7dc-2986-4b3e-a039-c9afd4b5d77f.png?resizew=218)
(1)求证
;
(2)求证
;
(3)若
,
,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c056a26c993ab806c603f063f78da923.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/b7bcf7dc-2986-4b3e-a039-c9afd4b5d77f.png?resizew=218)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494bf14f8369edcb5ba24413e91fd473.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
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【推荐1】如图,平行四边形
的对角线
相交于点O,
.
;
(2)连接
,若
,试探究四边形
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff3fe07947f23d6e53d23248be5ba54.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e825678030322bf7eb2f0249bf28ae25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8aed88ad640f3d76735f1e5dbc04b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
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【推荐2】如图,将
绕顶点A逆时针旋转
至
.连接
.
(1)若
,
,求
的度数.
(2)若
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/1d6dd2dc-6471-4aeb-9df5-d9e451975a05.png?resizew=202)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a70f42dccbe717bd85872938e26412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6253daa345791eb87d01a0deef8fa4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
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【推荐2】感知:如图①,在四边形 ABCD 中,AB
CD,∠B=90°,点 P 在 BC 边上,当∠APD=90°时,△ABP 与△PCD 是否相似? (填“是”或“否”).
探究:如图②,在四边形 ABCD 中,点 P 在 BC 边上,当∠B=∠C=∠APD 时,求证:△ABP∽△PCD.
拓展:如图③,在△ABC 中,点 P 是边 BC 的中点,点 D、E 分别在边 AB、AC 上.若∠B=∠C=∠DPE=45°,
BC=
,CE=9,则 DE 的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
探究:如图②,在四边形 ABCD 中,点 P 在 BC 边上,当∠B=∠C=∠APD 时,求证:△ABP∽△PCD.
拓展:如图③,在△ABC 中,点 P 是边 BC 的中点,点 D、E 分别在边 AB、AC 上.若∠B=∠C=∠DPE=45°,
BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354ec8391bdd39377804ee4dab1d8f1c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/31843ce6-2b7b-4a0c-b297-d3f8e60aa072.png?resizew=487)
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