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=2(20.15+20.30+15.30)
=2(300+600+450)
=2(1350)=2700(balok)
luas permukaan balok : 2( (p.t) + (t.l) + (l.p)
2( (20.15) + (15.30) + (30.20) )
2 ( 300 + 450 + 600)
2 (1350)
2700