作业帮图片在file://C:\Users\051388351969\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\LMO6UBWV\20110116112745-193894609[1].jpg如图所示,三角形ABC的个内角平分线相交于点O,过点O做AO的垂线分别交AB、AC于点
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/06 06:27:46
![图片在file://C:\Users\051388351969\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\LMO6UBWV\20110116112745-193894609[1].jpg如图所示,三角形ABC的个内角平分线相交于点O,过点O做AO的垂线分别交AB、AC于点](/uploads/image/z/6923593-1-3.jpg?t=%E5%9B%BE%E7%89%87%E5%9C%A8file%3A%2F%2FC%3A%5CUsers%5C051388351969%5CAppData%5CLocal%5CMicrosoft%5CWindows%5CTemporary+Internet+Files%5CContent.IE5%5CLMO6UBWV%5C20110116112745-193894609%5B1%5D.jpg%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%AA%E5%86%85%E8%A7%92%E5%B9%B3%E5%88%86%E7%BA%BF%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9O%2C%E8%BF%87%E7%82%B9O%E5%81%9AAO%E7%9A%84%E5%9E%82%E7%BA%BF%E5%88%86%E5%88%AB%E4%BA%A4AB%E3%80%81AC%E4%BA%8E%E7%82%B9)
图片在file://C:\Users\051388351969\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\LMO6UBWV\20110116112745-193894609[1].jpg如图所示,三角形ABC的个内角平分线相交于点O,过点O做AO的垂线分别交AB、AC于点
图片在file://C:\Users\051388351969\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\LMO6UBWV\20110116112745-193894609[1].jpg
如图所示,三角形ABC的个内角平分线相交于点O,过点O做AO的垂线分别交AB、AC于点D、E,求证三角形BOC相似于BOC、OEC
图片在file://C:\Users\051388351969\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\LMO6UBWV\20110116112745-193894609[1].jpg如图所示,三角形ABC的个内角平分线相交于点O,过点O做AO的垂线分别交AB、AC于点
在三角形CEO和三角形COB中,
角ECO=角OCB
角CEO=90°+二分之一角A,角COB=90°+二分之一角A
从而这两个三角形相似.