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125=3*6*c
125=18c /:18
c=7
P=2(ab+ac+bc) Podstawiasz i obliczasz
a = 3 cm
b = 6 cm
V = 125 cm³
Pc = ? [cm²]
Pc = 2(ab + ac + bc)
V = abc
V = (3 cm)(6 cm)c
V = (18 cm²)c
(18 cm²)c = 125 cm³ / : (18 cm²)
c = 6,9 cm
Pc = 2[(3 cm)(6 cm) + (3 cm)(6,9 cm) + (6 cm)(6,9 cm)]
Pc = 2(18 cm² + 20,7 cm² + 41,4 cm²)
Pc = 2*80,1 cm²
Pc = 160,2 cm²
Odp: Pole powierzchni całkowitej prostopadłościanu wynosi 160,2 cm² .