在四边形ABCD中,
,
,求证:四边形ABCD是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2721ac4ff98f561daae2d59c84d97c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923e40c9e7682a0c2d0006b6398c1e5e.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-11-12 10:07:17
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【知识点】 向量在几何中的其他应用解读
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解答题-问答题
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【推荐1】在
中,角A,B,C的对边分别为a,b,c.设
.
(1)求角C;
(2)若D为AB中点,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e51e0b527e823e684ea5ef5156e2ae.png)
(1)求角C;
(2)若D为AB中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204fb7cfd350a616164c68ec109880ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
|
较易
(0.85)
【推荐2】已知点
,向量
,过点
以向量
为方向向量的直线为
,求点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fe7eff7abfdd092b63c9c1b82d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25df6e6470dc9b7144ce78e203521c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e163480714acc9dae5005cac65d217d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76b94fa972f92861f2fb70bed2ff9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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