如图,直角
是水平放置的
的直观图,
对应直角坐标系中的坐标原点
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba66edf48a2d7377cc20f8f514062b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591978de7586fd52294552d8b5390206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624079f2359b362906b27674621ce543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/431ead43-cb2a-48c7-9bf2-d9f949411d19.png?resizew=201)
更新时间:2023-08-06 22:24:23
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解题方法
【推荐1】已知三角形
的斜二侧画法的直观图是边长为2的正三角形
(如图所示),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9dd315a4f697285399eb924e7736116.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1264a2e3609e1c274acb89b5ea5019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9dd315a4f697285399eb924e7736116.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/55a4012b-2a13-4f6a-8b16-7814d8a5821f.png?resizew=161)
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【推荐2】如图,
是
的直观图(斜二测画法),其中
与
重合,
在
轴上,且
轴,
,
,则
的最长边长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7310211fcb027421880aa21d57802594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6212febbda56add67df7641d5d422234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3557809c066e68395b614535a7675e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82476c11b9ec3973464b2395e4a6690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36eff13708a17d2bb53bd0347353aca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3d59ead251dc7da00505f60f200a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b17651d046485874b036115787fdcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2017/12/13/1837620218273792/1838815032713216/STEM/cde5e55f72a24aa79f97b507135b15ca.png?resizew=145)
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【推荐1】一个水平放置的平面图形的直观图是如图所示的梯形
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e954754ae2e57cc1666e8a0ae8302c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
,
,则原平面图形的周长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e954754ae2e57cc1666e8a0ae8302c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/52e1d393-3d6e-402c-b8d2-d8c5ac9e6203.png?resizew=167)
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【推荐2】某组合体的正视图和侧视图如图(1)所示,它的俯视图的直观图是图(2)中粗线所表示的平面图形,其中四边形O′A′B′C′为平行四边形,D′为C′B′的中点,则图(2)中平行四边形O′A′B′C′的面积为___________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/cea96be7-dcde-46a4-8210-d5fa75289fd9.png?resizew=419)
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