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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
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如图，正四面体的长为1， ， 则． sketch template
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7．如图正四面体的棱长均为且平面于A点BCD均在平面外且在平面同一侧则点B到平面的距离是 A． B． C． D．——青夏教育精英 sketch template
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