如图,直角三角形两条直角边AC、BC边长分别是3和4,则AB上的中线长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/940e9077-fc80-4512-a75b-6769da54ce45.png?resizew=89)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/940e9077-fc80-4512-a75b-6769da54ce45.png?resizew=89)
A.5 | B.2.5 | C.2.4 | D.3 |
更新时间:2022-10-14 16:53:41
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【推荐1】如图,在Rt△ABC中,∠C=90°,sinA=
,BC=3,则AC的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/973d5b8e-2933-441d-9bf7-331fe7b2d067.png?resizew=129)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/973d5b8e-2933-441d-9bf7-331fe7b2d067.png?resizew=129)
A.3 | B.4 | C.5 | D.6 |
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【推荐2】新冠疫情防控过程中,某中学在大门口的正上方A处装着一个红外线激光测温仪,离地
米(如图所示),当人体进入感应范围内时,测温仪就会显示人体体温.一个身高1.6米的学生(
米)正对门缓慢走到离门1.2米的地方时(
米),测温仪自动显示体温,则人头顶离测温仪的距离
等于( )
![](https://img.xkw.com/dksih/QBM/2022/3/4/2928868228194304/2938205217693696/STEM/753d0d43-f5db-4826-999c-406e5ea20478.png?resizew=143)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af983361a1a296fefbc2ae1a419295d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc627561077b80e683a16bbfb5be61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885517a9fd38802fefe1c455bbd473d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2022/3/4/2928868228194304/2938205217693696/STEM/753d0d43-f5db-4826-999c-406e5ea20478.png?resizew=143)
A.1.2米 | B.1.3米 | C.1.4米 | D.1.5米 |
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【推荐1】如图,在
中,
,
,将
以C为旋转中心,顺时针旋转角度
(
),若
的中点O恰好在AC上,则旋转角
的度数是( )
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105254924206080/3106722945040384/STEM/30e462d1b7ed4c6ebd73ee73ff4269b9.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3f34b0932d146055ae7eb832295902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105254924206080/3106722945040384/STEM/30e462d1b7ed4c6ebd73ee73ff4269b9.png?resizew=173)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在Rt△ABC中,∠BAC=90°,点D、E、F分别是三边的中点,且DE=4cm,则AF的长度是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/97eb031c-0a41-42e4-b0d7-59bae4804bf0.png?resizew=186)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/97eb031c-0a41-42e4-b0d7-59bae4804bf0.png?resizew=186)
A.2cm | B.3cm | C.4cm | D.6cm |
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