阅读材料:如图,
中,
,
为底边
上任意一点,点
到两腰的距离分别为
,腰上的高为
,连接
,则
,即:
,∴
(定值).
(1)理解与应用:如图,在边长为
的正方形
中,点E为对角线
上的一点,且
,
为
上一点,
于
,
于
,试利用上述结论求出
的长.
(2)类比与推理:如果把“等腰三角形”改成“等边三角形”,那么
的位置可以由“在底边上任一点”放宽为“在三角形内任一点”,即:已知等边
内任意一点
到各边的距离分别为
,等边
的高为
,试证明
(定值).
(3)拓展与延伸:若正
边形
,内部任意一点
到各边的距离为
,请问
是否为定值?如果是,请合理猜测出这个定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6588a9740bdb6522396c82f7fa7649b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a396d6b4516a32eba7d462c5ff2177f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168229a2e2e3834fb513a5b19b6bd65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd57bfd2937ad8d925f3a56962a936f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/93dd63cf-e1fd-459b-9986-ffff37effa7c.jpg?resizew=133)
(1)理解与应用:如图,在边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5af132cde2fa211adebf4ef6e2d6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf2c43f0aeae2f65de2a444005edec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59355e7a0fda469e3dc879bfb3b3b82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/76d6413b-6c29-4cf4-b7fa-a2db84d0083b.jpg?resizew=125)
(2)类比与推理:如果把“等腰三角形”改成“等边三角形”,那么
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7955a5c995eaa055e00ce81f948e7d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c23e0b33ffae80ebb7a779ea8eab1d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/8f604bce-53af-4db3-be99-8f64ae2e3ef1.jpg?resizew=134)
(3)拓展与延伸:若正
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7e998633940aafaf14e22e1f50a7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286815483319b800026fb61ee6b700b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/726e80543c405278eacab646b97dfc1c.png)
更新时间:2023-06-26 06:44:37
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