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L = 2 ( pl + pt + lt )
L = 2 ( 15.10 + 15.12 + 10.12 )
L = 2 ( 150 + 180 + 120 )
L = 2 ( 450 )
L = 900 cm²
l = 10 cm
t = 12 cm
LP = 2((p × l) + (p × t) + (l × t))
= 2((15 × 10) + (15 × 12) + (10 × 12))
= 2(150 + 180 + 120)
= 2(450)
= 900 cm²
Jadi luas karton tersebut adalah 900 cm²