如图,在
中,
,
,
.若
,
分别为
,
的中点,则
的长为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/602a6004-59d5-4aad-b912-6891fbab186f.png?resizew=155)
更新时间:2024-03-14 14:27:23
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【推荐2】古人认为“天圆地方”,故以圆璧祭天,以玉琮祭地,《周礼·春官·大宗伯》记载“以玉作六器,以礼天地四方”,长江流域良渚文化,创制美玉,尤以琮(如图1所示)、璧最为经典. 琮为内圆外方之器,此玉琮素面琢磨细腻,色泽温润,两端射口稍露,比例恰到好处. 如图2,是“琮”的横截面的示意图,其“外方”是一个边长为
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