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Verified answer
Luas permukaan balok =luas permukaan pertama=36cmx18cm= 648cm²x2=1296cm2
luas permukaan kedua=18cmx20cm= 360cm²x2=720cm²
luas permukaan ketiga=36cmx20cm= 720cm²x2=1440cm²
total luas permukaan =
1296cm²+720cm²+1440cm²= 3.456cm²
Bab Bangun Ruang
Luas permukaan
= 2 x (p x l + p x t + l x t)
= 2 x (36 x 18 + 36 x 20 + 18 x 20)
= 2 x (648 + 720 + 360)
= 2 x 1.728
= 3.456 cm²