如图,△ABC是一块锐角三角形材料,高线AH长8cm,底边BC长10cm,要把它加工成一个矩形零件,使矩形DEFG的一边EF在BC上,其余两个顶点D、G分别在AB、AC上,AH交DG于M.
(1)求证:AM•BC=AH•DG;
(2)加工成的矩形零件DEFG的面积能否等于25cm2?若能,求出宽DE的长度;否则,请说明理由.
(1)求证:AM•BC=AH•DG;
(2)加工成的矩形零件DEFG的面积能否等于25cm2?若能,求出宽DE的长度;否则,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/9c23064d-57eb-4640-ac32-6291c1eee983.png?resizew=200)
更新时间:2018-04-10 12:55:45
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【知识点】 相似三角形的判定与性质综合
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解答题-问答题
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适中
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【推荐1】如图1,以
的直角边
为直径作
,交斜边
于点D,点E是
的中点,连接
,
.
是
的切线;
(2)【拓展】如图2,点F在
的延长线上,点M在线段
上,
于点N,
交
于点G.求证:
;
(3)【运用】在(2)的条件下,若
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)【拓展】如图2,点F在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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(3)【运用】在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
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解答题-证明题
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适中
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【推荐2】如图,在
中,
,
是
的平分线,点
在
上,
经过
,
两点,交
于点
.
(1)求证:
是
的切线.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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