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12000 = p x 20 x 15
12000 = p x 300
p = 12000/300
p = 40 cm
luas permukaan = p x l = 40 x 20 = 800 cm²
1200= p. 20.15
1200= p. 300
p= 1200/300
p= 40
l.permukaan =(p.l)+(p.t)+(l.t)
=(40.20)+(40.15)+(20.15)
= 800+ 600+300= 1700 cm