如图,以点O为位似中心,在点O同侧作△DEF,使得△DEF与△ABC成位似图形,若OA:OD=1:2,则△ABC与△DEF的周长比为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/e5c017ec-15cd-41ae-8661-4725c36a3f89.png?resizew=204)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/e5c017ec-15cd-41ae-8661-4725c36a3f89.png?resizew=204)
A.1:2 | B.1:3 | C.1:4 | D.1:5 |
更新时间:2022-04-30 20:39:36
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【推荐2】若△ABC∽△DEF且面积比为9:25,则△ABC与△DEF的周长之比为( )
A.9:25 | B.3:25 | C.3:5 | D.2:5 |
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【推荐1】如图,
与
位似,其位似中心为点
,且
,则
与
的位似比是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e449f4538c8b5e6b59060aa201b6011a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
与
位似,点
为位似中心.已知
,
.
的周长为3,则
的周长是( )
![](https://img.xkw.com/dksih/QBM/2022/3/11/2934058415104000/2938198626729984/STEM/b6e4a638-aca4-42c2-a5d4-38f19fba660b.png?resizew=406)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78691dacfa00dd2448b1ba94b264ec8b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/2022/3/11/2934058415104000/2938198626729984/STEM/b6e4a638-aca4-42c2-a5d4-38f19fba660b.png?resizew=406)
A.4 | B.6 | C.9 | D.27 |
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