已知:如图,在
中,
,O为垂足.求证:
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/3ccf3f96-083f-4fa3-a7c9-da41c9d06082.png?resizew=164)
21-22八年级下·全国·课后作业 查看更多[2]
更新时间:2022-11-28 19:48:49
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【推荐1】如图,AB=AC,AC的垂直平分线交AB于D,交AC于E.
(1)若∠A=40°,求∠BCD的度数;
(2)若AE=5,△BCD的周长17,求△ABC的周长.
(1)若∠A=40°,求∠BCD的度数;
(2)若AE=5,△BCD的周长17,求△ABC的周长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/b7bf5d91-4088-4744-a99d-1d4e03dae9cb.png?resizew=161)
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【推荐2】如图,已知在△ABC中,∠BAC为直角,AB=AC,D为AC上一点,CE⊥BD于E,交BA的延长线于F.
(1)求证:△ABD≌△ACF;
(2)若BD平分∠ABC,求证:CE=
BD;
(3)若D为AC上一动点,∠AED如何变化?若变化,求它的变化范围;若不变,求出它的度数,并说明理由.
(1)求证:△ABD≌△ACF;
(2)若BD平分∠ABC,求证:CE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)若D为AC上一动点,∠AED如何变化?若变化,求它的变化范围;若不变,求出它的度数,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/74146804-9c46-4100-9fc4-53dfe8e8be1d.png?resizew=154)
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【推荐1】已知:如图,在平行四边形
中,E,F是对角线
上的两点,且
,求证:
;
(2)四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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【推荐2】如图,
中,点E是
边的中点,延长
交
的延长线于点F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐1】如图,在平行四边形
中,过对角线
的中点
作垂线
交边
,
分别为点
,
,连接
,
.求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】如图,在矩形ABCD中,点O为对角线AC的中点,过点O作
交BC于点E,交AD于点F,连接AE,CF.
(1)求证:四边形AECF是菱形;
(2)连接OB,若
,
,求OB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
(1)求证:四边形AECF是菱形;
(2)连接OB,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/9535d9ab-43c6-49ab-a5dc-8d2772bd9f40.png?resizew=205)
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