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Sisi depan = 72 cm² ⇒ pt = 72 cm²
Sisi samping = 30 cm² ⇒ lt = 30 cm²
Perhatikan bahwa
pl · pt · lt = p² · l² · t²
= (p · l · t)²
= V²
Diperoleh rumus
V = √[(pl) · (pt) · (lt)]
= √[(60)(72)(30)]
= √[129.600]
= 360 cm³
Jadi, Volume balok = 360 cm³