圆锥的表面积是底面积的3倍,那么该圆锥的侧面展开图扇形的圆心角为(我知道百度上有答案,我想...)我最后一步弄不懂,我已经算出来l=2r但不知道要怎么求圆心角,
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 04:27:24
![圆锥的表面积是底面积的3倍,那么该圆锥的侧面展开图扇形的圆心角为(我知道百度上有答案,我想...)我最后一步弄不懂,我已经算出来l=2r但不知道要怎么求圆心角,](/uploads/image/z/2766693-21-3.jpg?t=%E5%9C%86%E9%94%A5%E7%9A%84%E8%A1%A8%E9%9D%A2%E7%A7%AF%E6%98%AF%E5%BA%95%E9%9D%A2%E7%A7%AF%E7%9A%843%E5%80%8D%2C%E9%82%A3%E4%B9%88%E8%AF%A5%E5%9C%86%E9%94%A5%E7%9A%84%E4%BE%A7%E9%9D%A2%E5%B1%95%E5%BC%80%E5%9B%BE%E6%89%87%E5%BD%A2%E7%9A%84%E5%9C%86%E5%BF%83%E8%A7%92%E4%B8%BA%28%E6%88%91%E7%9F%A5%E9%81%93%E7%99%BE%E5%BA%A6%E4%B8%8A%E6%9C%89%E7%AD%94%E6%A1%88%2C%E6%88%91%E6%83%B3...%EF%BC%89%E6%88%91%E6%9C%80%E5%90%8E%E4%B8%80%E6%AD%A5%E5%BC%84%E4%B8%8D%E6%87%82%2C%E6%88%91%E5%B7%B2%E7%BB%8F%E7%AE%97%E5%87%BA%E6%9D%A5l%3D2r%E4%BD%86%E4%B8%8D%E7%9F%A5%E9%81%93%E8%A6%81%E6%80%8E%E4%B9%88%E6%B1%82%E5%9C%86%E5%BF%83%E8%A7%92%2C)
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