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xcm * 3xcm * 5xcm = 120cm³
15xcm³ = 120cm³ ||:15
xcm³ = 8cm³ ||³√
x cm = 2cm
3x cm = 3 * 2cm
3x cm = 6cm
5x cm = 5 * 2cm
5x cm = 10cm
P = 2(2cm * 6cm) + 2(6cm * 10cm) + 2(2cm * 10cm)
P = 2 * 12cm² + 2 * 60cm² + 2 * 20cm²
P = 2 * (12cm² + 60cm² + 20cm²)
P = 2 * 92cm²
P = 184cm²