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r=1/2*12√2
r=6√2
Pb=2π6√2*12
Pb=144π√2
promień podstawy=½ przekatnej tego kwadratu
a=12cm
d=a√2=12√2cm
r=½d=½×12√2=6√2cm
h walca=12cm
r=6√2cm
pole boczne=2πrh
pole boczne=2π×6√2×12=144√6πcm²