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volume = p x l x t
2000 = 20 x l x 10
2000 = 200 x l
Lebar = 2000 ÷ 200
Lebar = 10 cm
Luas permukaan
= (2 x p) + (2 x l) + (2 x t)
= (2 x 20) + (2 x 10) + (2 x 10)
= 40 + 20 + 20
= 80 cm²