18. 如图已知正四棱柱中底面边长侧棱的长为4过点作的的垂线交侧棱于点交于点. 1求证平面 2求与平面所成的角的正弦值 Template




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tomski18. 如图已知正四棱柱中底面边长侧棱的长为4过点作的的垂线交侧棱于点交于点. 1求证平面 coloring