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54cm³ = 6cm*b*c
b*c = 54cm³ : 6cm
b*c = 9cm² ------> pole podstawy prostopadłościanu, która jest kwadratem
b*c = 9cm²
b = c = 3cm
Pc = 4*6cm*3cm + 2*9cm² = 72cm² + 18cm² = 90cm²
Pole prostopadłościanu wynosi 90cm²