急,在等着 平行四边形的题如图,在△ABC中,AB=AC,点D在BC上,DE‖AC,DF‖AB.AC=6cm,求四边形AEDF的周长.图:http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D4%DA%A1%F7ABC%D6%D0%2CAB%3DAC%2C%B5%E
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 10:25:28
![急,在等着 平行四边形的题如图,在△ABC中,AB=AC,点D在BC上,DE‖AC,DF‖AB.AC=6cm,求四边形AEDF的周长.图:http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D4%DA%A1%F7ABC%D6%D0%2CAB%3DAC%2C%B5%E](/uploads/image/z/3174261-69-1.jpg?t=%E6%80%A5%2C%E5%9C%A8%E7%AD%89%E7%9D%80+%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E7%9A%84%E9%A2%98%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2C%E7%82%B9D%E5%9C%A8BC%E4%B8%8A%2CDE%E2%80%96AC%2CDF%E2%80%96AB.AC%3D6cm%2C%E6%B1%82%E5%9B%9B%E8%BE%B9%E5%BD%A2AEDF%E7%9A%84%E5%91%A8%E9%95%BF.%E5%9B%BE%EF%BC%9Ahttp%3A%2F%2Fimage.baidu.com%2Fi%3Fct%3D503316480%26z%3D0%26tn%3Dbaiduimagedetail%26word%3D%25C8%25E7%25CD%25BC%252C%25D4%25DA%25A1%25F7ABC%25D6%25D0%252CAB%253DAC%252C%25B5%25E)
急,在等着 平行四边形的题如图,在△ABC中,AB=AC,点D在BC上,DE‖AC,DF‖AB.AC=6cm,求四边形AEDF的周长.图:http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D4%DA%A1%F7ABC%D6%D0%2CAB%3DAC%2C%B5%E
急,在等着 平行四边形的题
如图,在△ABC中,AB=AC,点D在BC上,DE‖AC,DF‖AB.AC=6cm,求四边形AEDF的周长.
图:http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D4%DA%A1%F7ABC%D6%D0%2CAB%3DAC%2C%B5%E3D%D4%DABC%C9%CF%2CDC%A1%ACAC%2CDF%A1%ACAB%2EAC%3D6cm%2C%C7%F3%CB%C4%B1%DF%D0%CEAEDF%B5%C4%D6%DC%B3%A4&in=16474&cl=2&cm=1&sc=0&lm=-1&pn=15&rn=1&di=7391149792&ln=2000&fr=
急,在等着 平行四边形的题如图,在△ABC中,AB=AC,点D在BC上,DE‖AC,DF‖AB.AC=6cm,求四边形AEDF的周长.图:http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D4%DA%A1%F7ABC%D6%D0%2CAB%3DAC%2C%B5%E
证△BED和△DFC全等
然后四边形AEDF的周长就是6+6=12cm
呵呵
你好笨啊
周长为12.
因为 AB=AC=6
所以也就是 AE+DE+AF+DF=6x2=12
12