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diagonal sisi = √(12x)² + (4x)²
= √160x² => 4x√10
diagonal ruang = √{√(160x²)² + (3x)²
65 = √(160 x² + 9x²
65 = √169x²
65 = 13x
5 = x
masukkan x = 5 ke
p =12x -> p=60
l = 4x -> l=20
t = 3x -> t = 15
volume =p x l x t
v = 60 x 20 x 15
v = 18000