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a - bok
d=a√2
d=a+2
a+2=a√2
a√2-a=2
a(√2-1)=2
a=2/(√2-1)
a=(2√2+2)cm
L=4(2√2+2)
L=(8√2+8)cm
Obwód tego kwadratu wynosi (8√2+8)cm