立体几何问题,急,天才进,1.直线L与平面a所成角为30°,L与平面a相交于点A,直线M属于平面a,则M与L所成角的取值范围是多少?2.在正三棱锥P-ABC中,AB=4,PA=8,过A作与PB,PC分别交于D和E的截面,则截面△ADE
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![立体几何问题,急,天才进,1.直线L与平面a所成角为30°,L与平面a相交于点A,直线M属于平面a,则M与L所成角的取值范围是多少?2.在正三棱锥P-ABC中,AB=4,PA=8,过A作与PB,PC分别交于D和E的截面,则截面△ADE](/uploads/image/z/9928249-25-9.jpg?t=%E7%AB%8B%E4%BD%93%E5%87%A0%E4%BD%95%E9%97%AE%E9%A2%98%2C%E6%80%A5%2C%E5%A4%A9%E6%89%8D%E8%BF%9B%2C1.%E7%9B%B4%E7%BA%BFL%E4%B8%8E%E5%B9%B3%E9%9D%A2a%E6%89%80%E6%88%90%E8%A7%92%E4%B8%BA30%C2%B0%2CL%E4%B8%8E%E5%B9%B3%E9%9D%A2a%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9A%2C%E7%9B%B4%E7%BA%BFM%E5%B1%9E%E4%BA%8E%E5%B9%B3%E9%9D%A2a%2C%E5%88%99M%E4%B8%8EL%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%E5%A4%9A%E5%B0%91%3F2.%E5%9C%A8%E6%AD%A3%E4%B8%89%E6%A3%B1%E9%94%A5P-ABC%E4%B8%AD%2CAB%3D4%2CPA%3D8%2C%E8%BF%87A%E4%BD%9C%E4%B8%8EPB%2CPC%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8ED%E5%92%8CE%E7%9A%84%E6%88%AA%E9%9D%A2%2C%E5%88%99%E6%88%AA%E9%9D%A2%E2%96%B3ADE)
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