已知:在平行四边形ABCD 中,点O是对角线AC与BD的交点,∠EOB=30°,EF是以点O为中点的线段. (1)当EF绕点O任意旋转时(EF不与BD 重合,)四边形BFDE是平行四边形.(2)当EF绕点O旋转几度四边形BFDE为
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/02 04:43:23
![已知:在平行四边形ABCD 中,点O是对角线AC与BD的交点,∠EOB=30°,EF是以点O为中点的线段. (1)当EF绕点O任意旋转时(EF不与BD 重合,)四边形BFDE是平行四边形.(2)当EF绕点O旋转几度四边形BFDE为](/uploads/image/z/14906603-11-3.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD+%E4%B8%AD%2C%E7%82%B9O%E6%98%AF%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E4%B8%8EBD%E7%9A%84%E4%BA%A4%E7%82%B9%2C%E2%88%A0EOB%3D30%C2%B0%2CEF%E6%98%AF%E4%BB%A5%E7%82%B9O%E4%B8%BA%E4%B8%AD%E7%82%B9%E7%9A%84%E7%BA%BF%E6%AE%B5%EF%BC%8E+%281%29%E5%BD%93EF%E7%BB%95%E7%82%B9O%E4%BB%BB%E6%84%8F%E6%97%8B%E8%BD%AC%E6%97%B6%EF%BC%88EF%E4%B8%8D%E4%B8%8EBD+%E9%87%8D%E5%90%88%2C%EF%BC%89%E5%9B%9B%E8%BE%B9%E5%BD%A2BFDE%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2.%EF%BC%882%EF%BC%89%E5%BD%93EF%E7%BB%95%E7%82%B9O%E6%97%8B%E8%BD%AC%E5%87%A0%E5%BA%A6%E5%9B%9B%E8%BE%B9%E5%BD%A2BFDE%E4%B8%BA)
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