例4、正四面体的棱长为a,则其内切球和外接球的半径是多�体积是多�? 练习: 角度一 直三棱柱的外接球1.2013辽宁高考已知直三棱柱 Template




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tomski例4、正四面体的棱长为a,则其内切球和外接球的半径是多�体积是多�? 练习: 角度一 coloring