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vlum : p . L . t
720 : 6 . 4 . t
720 : 24t
t : 720/24
t : 30
luas permukaan
: 2 (p . L) + 2(p .t) + 2(L . t)
: 2 ( 6 .4) + 2( 6.30) + 2(4.30)
:48 + 360 + 240
: 648 cm^2