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a)
8×10mm + 8×6mm + 16×4mm = 80mm + 48mm + 64mm = 192mm = 19,2 cm
odp. Bransoletka ma długość 19,2 cm.
12.
r=5 cm
średnica = 2r = 10 cm
2 × 10 cm = 20 cm
4 × 10 cm = 40 cm
2 × 12cm = 24 cm
Wymiary tego pudełka:
20 cm × 40 cm × 24 cm