如图所示,在△ABC中,DE、MN是边AB、AC的垂直平分线,其垂足分别为D、M,分别交BC于E、N,且DE和MN交于点F.(1)若∠EAN=40,求∠F的度数,(2)若AB=8,AC=9,求△AEN周长的范围.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/11 12:06:36
![如图所示,在△ABC中,DE、MN是边AB、AC的垂直平分线,其垂足分别为D、M,分别交BC于E、N,且DE和MN交于点F.(1)若∠EAN=40,求∠F的度数,(2)若AB=8,AC=9,求△AEN周长的范围.](/uploads/image/z/10157440-40-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CDE%E3%80%81MN%E6%98%AF%E8%BE%B9AB%E3%80%81AC%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF%2C%E5%85%B6%E5%9E%82%E8%B6%B3%E5%88%86%E5%88%AB%E4%B8%BAD%E3%80%81M%2C%E5%88%86%E5%88%AB%E4%BA%A4BC%E4%BA%8EE%E3%80%81N%2C%E4%B8%94DE%E5%92%8CMN%E4%BA%A4%E4%BA%8E%E7%82%B9F%EF%BC%8E%EF%BC%881%EF%BC%89%E8%8B%A5%E2%88%A0EAN%3D40%2C%E6%B1%82%E2%88%A0F%E7%9A%84%E5%BA%A6%E6%95%B0%2C%EF%BC%882%EF%BC%89%E8%8B%A5AB%3D8%2CAC%3D9%2C%E6%B1%82%E2%96%B3AEN%E5%91%A8%E9%95%BF%E7%9A%84%E8%8C%83%E5%9B%B4%EF%BC%8E)
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