棱长为2的正四面体的四个顶点都在同一个球面上若过该球球心的一个截面如图则图中三角形的面积是 . 题目和参考答案——青夏教育精英家教�—— Template




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tomski棱长为2的正四面体的四个顶点都在同一个球面上若过该球球心的一个截面如图则图中三角形的面积是 . 题目和参考答案——青夏教育精英家教�—— coloring