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P=a*b
P=60*18,5
P=1110cm^2
L=2a+2b
L=60+60+18,5+18,5
L=157cm
Ob=2a+2b
6dm=60cm
P=60*18,5=6*185=1110cm2
Ob=2*60+2*18,5=120+37=157cm