如图,在
中,
平分
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/50e3b133-4a75-4491-9c5d-e4b7c26a2e9b.png?resizew=188)
(1)尺规作图:作
的垂直平分线,分别交
,
于点
,
,连接
,
;(不写作法,保留作图痕迹)
(2)小川判断四边形
是菱形,他的证明思路是:利用垂直平分线的性质,先证明
、
为等腰三角形,再利用平行线的判定得到四边形
为平行四边形,从而得到四边形
是菱形.
证明:
平分
,
① ,
是
的垂直平分线,
,② ,
,
,
,
,
,③ ,
四边形
为平行四边形,
④ ,
四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/50e3b133-4a75-4491-9c5d-e4b7c26a2e9b.png?resizew=188)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)小川判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a37ba261860ddad9d11b2e8348a8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a4eaa7ab2b78129369804b228fee86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173f7d26d069c0f16a0f6fcb517aa28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d03c3514cb5bfafccf126420523cc10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70324b4267022ed3709cda5aefb3735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a4799a06a2a35bc069ff23bef208cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf17dff06008e7b558ff48ad6c6b9408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162668a4ffeae2d8b016b95c70551ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7698322222612578b1ddb991f776853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
更新时间:2024-04-06 22:40:03
|
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