如图,矩形
中,点
分别在边
与
上,点
在对角线
上,
,
.
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313165767507968/2314088337506304/STEM/e9e9360ff90b479581a74959569b7d41.png?resizew=188)
求证:四边形
是平行四边形.
若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af99797a4b66560829f0eaf800627746.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/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6baf820ff60f2015ae352f2b1bc3aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313165767507968/2314088337506304/STEM/e9e9360ff90b479581a74959569b7d41.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9b74a6609450a154847baa28fe0382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2019-10-17 20:47:41
|
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【推荐1】大别山旅游资源丰富,某景区为给游客提供更好的游览体验,拟在如图1景区内修建观光索道,设计示意图如图2所示,以山脚A为起点,沿途修建
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平行的观光平台
,长度为
.索道
与
的夹角为
,
与水平线的夹角为
.A,B两处的水平距离
为
,
,垂足为F(图中所有点都在同一平面内,点A,E,F在同一水平线上,计算结果精确到
,参考数据:
,
,
,
)
(1)求索道
的长.
(2)求水平距离
的长.
![](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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c56c87fd6bf8a44244ba51a9d244e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4fc1342191ef5ac8bf1c608f1cf8cd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2daba8f5ea421e28f7622bc931a29d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa9e8cfc4ab8f323923bfe752a02985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324b27cd4463f65b0b08259bcf992683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/12/1bdddef9-2388-4d0a-9c06-2d0c1e08917b.png?resizew=389)
(1)求索道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求水平距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】如图,⊙O的半径OC⊥AB,D为
上一点,DE⊥OC,DF⊥AB,垂足分别为E、F,EF=3,求直径AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://img.xkw.com/dksih/QBM/2019/1/11/2116621460971520/2118610494693376/STEM/723d66f254c84923b5a28dcaab9abbcb.png?resizew=133)
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解答题-证明题
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名校
【推荐1】如图,菱形ABCD的对角线AC,BD相交于点
,过点D作
,且
,连接
,连接
交
于点
.
(1)求证:
;
(2)若菱形ABCD的边长为4,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb73f854e7561c943b460e6c84e26fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6047a0228d514ad935f42f5bc881c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e0553d33bb5734a489fb8fe910cb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cede2006bf19da5ae1c126da517ce79c.png)
(2)若菱形ABCD的边长为4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/ee713eb4-e0e9-4589-93b2-446417655780.png?resizew=175)
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【推荐2】已知平行四边形ABCD,对角线AC、BD相交于点O,且CA=CB,延长BC至点E,使CE=BC,连接DE.
(1)当AC⊥BD时,求证:BE=2CD;
(2)当∠ACB=90°时,求证:四边形ACED是正方形.
(1)当AC⊥BD时,求证:BE=2CD;
(2)当∠ACB=90°时,求证:四边形ACED是正方形.
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