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d²=36cm²
d=6cm
P=a²
a²=18
a=√18=3√2
d-przekątna
d=a√2
d=3√2*√2=3√4=6cm
P=a²
a²=18
a=√18=3√2
d-przekątna
d=a√2
d=3√2*√2=3√4=6cm