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b) 2cm × 4 + 3,5cm × 4 + 4,5cm × 4 = 8cm + 14cm + 18cm = 40cm
c) P= 2×2×3,5 + 2×3,5×4,5 + 2×2×4,5= 14cm² + 31,5cm² + 18cm² = 63,5cm²
V= 4,5cm×2cm×3,5cm= 9cm × 3,5cm = 31,5cm³
prosze :) Licze naj ;)