操作:
和
都是等边三角形,
绕着
点按顺时针方向旋转,
是
、
的中点,有以下三种图形.
探究:
(1)在上述三个图形中,
是否一个固定的值,若是,请选择任意一个图形求出这个比值;
(2)
的值是否也等于这个定值,若是,请结合图(1)证明你的结论;
(3)
与
有怎样的位置关系,请你结合图(2)或图(3)证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a71399ec88d4a3bd807e23bef04dce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a71399ec88d4a3bd807e23bef04dce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
探究:
(1)在上述三个图形中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3147d733cdbb09cc97bca8df6a400da4.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001af0013664f27c1fc79fd6f21bfbe2.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182977397342208/2183187089981440/STEM/2abc1e1e9a4941e697683b5b7d5b8aa7.png?resizew=437)
更新时间:2019-04-15 22:08:24
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名校
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