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l=lebar
t=tinggi
ABCD=p.t=150 cm² (1)
ABFE=p.l=180 cm² (2)
BCGF=l.t=120 cm² (3)
mencari l
p.t=150
(180/l).(120/l)=150
l=12 cm
mencari p
p=180/l
p=180/12
p=15 cm
mencari t
t=120/l
t=120/12
t=10 cm
maka volume balok
V=p.l.t
V=15.12.10
V=1800 cm³