如图,已知点
和点
在线段
上,且
,点C和点F在
的同侧,
和
相交于点H.
(1)求证:
;
(2)当
时,猜想
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec782696dc78b1c94b650f163da3c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/6b1da7e5-0f15-4dd7-8162-a839f00aa7b8.jpg?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47a70a2811c174e73ce1beeb80c75c1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eabe7e82acc50b399b45b334d49a30cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafabd077934109c38255fa6d3a8bb60.png)
更新时间:2023-11-01 07:14:37
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【推荐1】如图,A、B、C、D是四个村庄,B、D、C三村在一条东西走向公路的沿线上,且D村到B村、C村的距离相等;村庄A、C,A、D间也有公路相连,且公路AD是南北走向;只有村庄A、B之间由于间隔了一个小湖,所以无直接相连的公路.现决定在湖面上造一座斜拉桥,测得AC=3千米,AE=1.2千米,BF=0.7千米.试求建造的斜拉桥至少有多少千米?
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解答题-证明题
|
较易
(0.85)
【推荐1】如图,已知
,点
是
的平分线
上一点,点
,
分别是边
,
上的点,且
.
(1)求证:
是等边三角形;
(2)若点
到
的距离为
,则
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/99fad684-567e-422d-bdd5-8eabec18cb52.jpg?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1c415dae20496b93f132c62783cd5d.png)
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【推荐2】如图,
为
的直径,点C为
上一点,过点O作
的垂线分别交
于点E,交
于点D,交过点C的切线于点F,连接
,
,
.
(1)试说明:
.
(2)填空:若
,则
①当
______时,四边形
是平行四边形;
②当
______cm,四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e779d9ef3281a867c07be504faa142a6.png)
(2)填空:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1138e82e53661e80f00d05bdcd4a4747.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db07c6ce6c8b0e96a3470c6a3491334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ff3ccc1d61e0da8a83fb0e421fd0f1.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
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