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K 3 kotak = 4 x 16 x 3 = 192 cm
K yg diarsir = 4 x 16 x 6 = 384 cm
Jadi 384 - 192 = 192 cm
Maaf kalo slah
= 1/2 x 45 x 12
= 540cm^2
maaf kalau salah