tolong jwab pake cara no 40

Lp = 2 ( 100 × 50 + 50 ×60 + 100 × 60 )
= 2 ( 5000 + 3000 + 6000 )
= 2 × 14000 = 28.000 cm (A )

L aquarium = L balok tanpa tutup
= (1 x p x l) + (2 x p x t) + (2 x l x t)
= (1 x 100 cm x 50 cm) + (2 x 100 cm x 60 cm) + (2 x 50 cm x 60 cm)
= 5.000 cm^2 + 12.000 cm^2 + 6.000 cm^2
= 23.000 cm^2

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