如图,三棱锥P-ABC的底面ABC是边长为2的正三角形,且PB=PC=根号2.求证PA垂直BC.{2}:若侧面PBC垂直底面ABC,求直线PA与底面ABC所成的角的大小
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![如图,三棱锥P-ABC的底面ABC是边长为2的正三角形,且PB=PC=根号2.求证PA垂直BC.{2}:若侧面PBC垂直底面ABC,求直线PA与底面ABC所成的角的大小](/uploads/image/z/9496169-17-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E4%B8%89%E6%A3%B1%E9%94%A5P-ABC%E7%9A%84%E5%BA%95%E9%9D%A2ABC%E6%98%AF%E8%BE%B9%E9%95%BF%E4%B8%BA2%E7%9A%84%E6%AD%A3%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E4%B8%94PB%3DPC%3D%E6%A0%B9%E5%8F%B72.%E6%B1%82%E8%AF%81PA%E5%9E%82%E7%9B%B4BC.%7B2%7D%3A%E8%8B%A5%E4%BE%A7%E9%9D%A2PBC%E5%9E%82%E7%9B%B4%E5%BA%95%E9%9D%A2ABC%2C%E6%B1%82%E7%9B%B4%E7%BA%BFPA%E4%B8%8E%E5%BA%95%E9%9D%A2ABC%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E7%9A%84%E5%A4%A7%E5%B0%8F)
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