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Lp = 2(La) + (Ka × t)
Lp = 2(s × s) + ((4 × s) × t)
864 = 2(s × s) + ((4 × s) × 12)
864 = 2(s²) + (4s × 12)
864 = 2s² + 48s
0 = 2s² + 48s - 864
0 = s² + 24s - 432
0 = (s + 36) (s - 12)
0 = s + 36
s₁ = -36
0 = s - 12
s₂ = 12
Jadi panjang sisi alas prisma tersebut adalah 12 cm.