下列每组数分别是三根木棒的长度,能用它们摆成三角形的是( )
A.2cm,3cm,6cm | B.1cm,2cm,3cm |
C.3cm,3cm,7cm | D.3cm,4cm,5cm |
更新时间:2020-01-10 17:19:49
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【知识点】 三角形三边关系的应用解读
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适中
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【推荐1】若等腰三角形的周长为19cm,一边长为7cm,则腰长为( )
A.7cm | B.5cm | C.7cm或5cm | D.7cm或6cm |
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单选题
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适中
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【推荐2】如图,
内接于
,
,
是
的弦,
,
.下列结论:①
;②
;③
;④
.其中所有正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a65af7a8-865f-4537-8ada-0ffebbca236d.png?resizew=306)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ea72fda75a031b6008e022c02492ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ba0ba8c9f644898e845b2b74a018bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a336cd377548b2fdb5630a35e332e2c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136269aa69ffcfcd3d2891e046d52f9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a65af7a8-865f-4537-8ada-0ffebbca236d.png?resizew=306)
A.①②③④ | B.②③ | C.②④ | D.②③④ |
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