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panjang: 4a
lebar: 3a
tinggi: 10 cm
vol: 1080 cm3
V= p x l x t
1080= 4a.3a.10
108=12a^2
9=a^2
3=a
a.) lebar: 3a= 3.3= 9
panjang: 4a= 4.3= 12
b.) 24+60+80= 164 cm2
X 10 = 1080
= 1080/10 = 108
X 108 = 144
= = 12
X 108 =81
= = 9