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Panjang diagonal sisi = sqrt (panjang^2 + lebar ^2) = sqrt (12^2 + 9^2) = 15
Kembali ke diagonal ruang
17^2 = 15^2 + tinggi^2
289=225 + t^2
64= t^2
8= t
Volume balok = p x l x t
=12 x9 x8= 864 cm3