已知,如图,点
为
内一点,
、
、
点分别为线段
、
、
上一点,且
,
.
![](https://img.xkw.com/dksih/QBM/2019/9/11/2288349243703296/2290018270248960/STEM/11134cc2636243f4bf2f5801d1438dfd.png?resizew=149)
(1)求证:
;
(2)当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c8d57fddb6933340fd8dd16aae246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714ff13ae8f730bea976c68182fe3e73.png)
![](https://img.xkw.com/dksih/QBM/2019/9/11/2288349243703296/2290018270248960/STEM/11134cc2636243f4bf2f5801d1438dfd.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bd9e8b54864ca44115d24a5aeeb83c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f3d8440dea91f7903ca1673d133411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdde8ed1ca5bfdf10ae4b7d1c74a544.png)
更新时间:2019-09-13 20:37:00
|
【知识点】 相似三角形的判定与性质综合
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图
中,
,以
的一条边
为直径作半圆
交
于点
,过点
作
于点
.
(1)求证:
是半圆
的切线.
(2)若
,
,求
的长.
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/0bf14ae2-216d-47b1-a378-dcfe60a62e3e.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知:如图ΔABC中,D、E、F分别是AB、AC、BC的中点.
![](https://img.xkw.com/dksih/QBM/2014/5/5/1573724382281728/1573724387893248/STEM/f6fdf096efe94fffb711f5f075e1eabd.png)
(1)若AB=10cm,AC=6cm,则四边形ADFE的周长为______cm
(2)若ΔABC周长为6cm,面积为12cm2,则ΔDEF的周长是 _____,面积是_____
![](https://img.xkw.com/dksih/QBM/2014/5/5/1573724382281728/1573724387893248/STEM/f6fdf096efe94fffb711f5f075e1eabd.png)
(1)若AB=10cm,AC=6cm,则四边形ADFE的周长为______cm
(2)若ΔABC周长为6cm,面积为12cm2,则ΔDEF的周长是 _____,面积是_____
您最近一年使用:0次