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1
r=a(1+√2)/2=4(1+√2)/2=2(1+√2)=2+2√2=2+2*1,41=4,82cm
√2=1,41
2
R=a√(2+√2)/2=6√(2+√2)/2=6√(1+√2/2)=6√(1+½*1,41)=6√(1+0,7050)=6√1,705=6*1,3=7,8 cm
√(2+√2)/2 całość jest pod znakiem√