Question

一个直棱柱的棱的条数为a,顶点数为b,侧面数为c,若a+b+c=32,则该直棱柱是直_____棱柱.

Answer 1

设该直棱柱是直 n 棱柱.

则有：a = 3n ,b = 2n ,c = n+2 ；

已知,a+b+c = 6n+2 = 32 ,

可得：n = 5 ,

即有：该直棱柱是直 5 棱柱.