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BF = tinggi (t)
Volume balok = p . l . t
96 = p . 4 . 3
p = 96/12 = 8 cm
Sesuai teori Phytagoras, maka:
(Diagonal sisi ABCD)² = AB² + BC²
AC² = p² + l²
AC² = 8² + 4²
AC² = 64+16
AC = √80 = 4√5 cm