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a = 2 \pi r
r = średnica/2 = 6cm/2 = 3cm
a = 2 * \pi * 3 = 6 \pi
Dane:
a = 6 \pi cm
b = 10cm
P = 6 \pi * 10 = 60 \pi [cm^2]
\pi \approx 3,14
P = 60 * 3,14 = 188,4 [cm^2] ma jedna etykieta.
Pole powierzchni bocznej 5000 puszek = 5000 etykiet
5000 * 188,4 cm^2 = 942000 cm^2
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1 m^2 = 100 cm * 100 cm = 10000 cm^2
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942000 / 10000 = 94,2 m^2