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a + 1 - krawedz drugiego.
Vpierwsze = a³
V drugie = (a+1)³ = Vpierwsz. + 61
a³ + 3a² + 3a + 1 = a³ + 61
3 a² + 3a - 60 = 0 / :3
a² + a - 20 = 0
delta = 1 + 80 = 81
√delta = 9
a1 = (-1-9) / 2 = -5 <-- nie moze byc ujemne
a2= (-1+9) / 2 = 4
czyli krawedz jest rowna 4
Pc = 6 * a² = 6 * 16 = 96cm²