(1)如图,在
中,
,求证:四边形
是平行四边形;
(2)当
时,四边形
是平行四边形吗?
(3)如果
呢?你能得出一个一般性的结论吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25d19dc7d39e3f661e888ed140b31ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b977f9880c3acc912c36aa3e2df56c9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ae5e39acb68f7fd6deca6b4d9ab015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b977f9880c3acc912c36aa3e2df56c9.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9992e2bb49b5de7645aeacff107d068e.png)
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833509131919360/2842063824207872/STEM/951cec3e14c34e81849908eed7da4aa0.png?resizew=175)
20-21八年级下·全国·课后作业 查看更多[2]
(已下线)【北师大版课时练习】 八年级下册 第六章 平行四边形 总复习(已下线)专题6.29 平行四边形(全章复习与巩固)(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
更新时间:2021-11-01 19:36:33
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】知识呈现:
如图①,在
中,
的平分线与
相交于点E,求证:
;
知识应用:
(1)如图②,在
中,点E在
上,
、
分别平分
、
,若
,
,则
______;
(2)如图③,在矩形
中,
,
,点E为
的中点,连接
,作
,则
______.
如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3404e1b57aec53b245dc680fa835159.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/4e807c70-d3de-4016-9cde-1e3e0a1f29cf.png?resizew=430)
知识应用:
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1258b3cc1a5b98a4f5cd9a80b181e941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
(2)如图③,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.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/4094ec4fc23f3df4ba3bf499e4b5f859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69902359ee6a72d601b919bf69f853f8.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知
,
的平分线和
的平分线相交于点E,连接
并延长交
于点D,且D恰好为
的中点.
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7e48723871f06a6aeae31a2a1ff79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/0715935d-6ec2-4430-951d-d6385c191192.png?resizew=101)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df65e6afde334b4575c347c7ba7af94f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
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解答题-证明题
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适中
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【推荐1】如图,在矩形
中,
两点在对角线
上,
.
(1)求证:四边形
是平行四边形;
(2)若
,直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/e943bfbf-c615-440f-a6cf-dcdbfa72ab0d.png?resizew=151)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca182b6ad0eaaadf15260ee6369d6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,D、E分别是不等边三角形ABC(即AB≠BC≠AC)的边AB、AC的中点.O是△ABC平面上的一动点,连接OB、OC,G、F分别是OB、OC的中点,顺次连接点D、G、F、E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/a5a3e9e0-6cd5-4d55-ade3-b8c21696b490.png?resizew=132)
(1)如图,当点O在△ABC内时,求证:四边形DGFE是平行四边形;
(2)若连接
,且满足
.问此时四边形DGFE又是什么形状?并请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/a5a3e9e0-6cd5-4d55-ade3-b8c21696b490.png?resizew=132)
(1)如图,当点O在△ABC内时,求证:四边形DGFE是平行四边形;
(2)若连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bec37ee9db53cfca394308ed9d24281.png)
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