如图,点D是AB的中点,DE⊥AC,AB=7.2,∠A=30°,则DE=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/009b29f4-a496-43fb-a7bd-646ce4ec6c5b.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/009b29f4-a496-43fb-a7bd-646ce4ec6c5b.png?resizew=154)
A.1.8 | B.2.4 | C.3.6 | D.4.8 |
更新时间:2022-07-11 17:06:04
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【知识点】 含30度角的直角三角形解读
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【推荐1】如图,矩形ABCD的对角线AC与BD相交于点O,夹角∠AOB=60°,已知AB=1,则△ABD的面积是( )
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【推荐2】如图,在
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A.3 | B.4 | C.4.5 | D.5 |
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