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Verified answer
P:l:t =5:4:2jumlah=5+4+2=11--->132 cm
p=5/11 x 132 =60 cm
l=4/11 x 132=48 cm
t=2/11x132=24 cm
Luas Permukaan balok = 2 (pl + pt + lt)
=2 ( 60x48)+2(60x24)+2(48x24)
=2 (2880+1440+1152)
=2 (5472)
=10.944 cm²