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ob=2a+2b
ob=2*10 1/2+2b
ob=21cm+2b
2b=32,8cm-21cm
2b=11,8cm
b=11,8/2
b=5,9cm
p=a*b
p=10 1/2*2,9
p=10,5*5,9
p=61,95cm2