如图,是某种帐篷支加架屋顶的侧面,它是底角为30°的等腰三角形,已知中柱
BD垂直于底边AC,支柱DE垂直于腰AB,侧得BE=1米,求AB的长.
BD垂直于底边AC,支柱DE垂直于腰AB,侧得BE=1米,求AB的长.
![](https://img.xkw.com/dksih/QBM/2013/2/21/1573604276289536/1573604312997888/STEM/ee0d578c8b1d41eeab943041a0063263.png)
更新时间:2016-12-05 16:09:04
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【推荐1】如图,△ABC中,已知AB=AC,BC平分∠ABD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/6a01f3de-9e5b-4a05-a01c-03acf7fb697c.png?resizew=122)
(1)求证:
;
(2)若∠A=100°,求∠1的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/6a01f3de-9e5b-4a05-a01c-03acf7fb697c.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e272d5020e1034740f8915597160f8.png)
(2)若∠A=100°,求∠1的度数.
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【推荐2】如图,在四边形
中,点
是
延长线上一点,过点
的直线分别交
,
,
交于点
,
,
,交
的延长线于点
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/411c9f24-30a1-4b93-8ce0-71a4dfbe1120.png?resizew=219)
(1)若
,求证:
平分
;
(2)若
,在不添加任何辅助线的条件下,你能找出图中有几对三角形全等,分别是哪些?请写出其中一对三角形全等的理由.
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(1)若
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(2)若
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【推荐1】如图,△ABC中,AB=12,BC=15,AD⊥BC于点D,∠BAD=30°,求tanC的值.
![](https://img.xkw.com/dksih/QBM/2019/1/9/2114970277806080/2115894280511488/STEM/8fc671e3ca6e4c43a02ab59a6e608fd0.png?resizew=112)
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【推荐2】如图,E,F是
的对角线AC上两点,
.
为平行四边形;
(2)若
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,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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(2)若
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