设æ£å
边形çè¾¹é¿ä¸ºa, ä¸åºä¸å¿ä¸ºP, ä¸åºå¨é¿=6a,设é«ä¸ºh, 侧é¢ç§¯=6ah=72, ah=12(1)
ä¸åºé¢ç§¯=6*(â3 a^2/4)*h=36â3, a^2*h=24 (2)
(2)å¼/(1)å¼, å¾a=2, 代å
¥(1), h=6
AD=2a=4, AA'=6, ççç´å¾ä¸ºAD'=â(4^2+6^2)=â52=2â13, r=â13
Vç=4/3 Ï*r^3=4/3 Ï*13 â13= 52â13/3
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