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a=2r/(1+√2)
r=2cm
a=2*2/(1+√2)=4/(1+√2)
obw=8a=8*4/(1+√2)=32/(1+√2)=32*(1-√2)/ (1+√2) (1-√2)= 32*(1-√2)/12-√22=32*(1-√2)/1-2 =
-32*(1-√2)