11.如图正四面体a Bcd的棱长为a点ef分别是棱bdbc的中点则平面aef截该正四面体的内切球所得截面的面积为 A. B Template




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tomski11.如图正四面体a bcd的棱长为a点ef分别是棱bdbc的中点则平面aef截该正四面体的内切球所得截面的面积为 a. coloring