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d-przekątna
a-bok kwadratu
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+1)/(√2-1)(√2+1)
a=2(√2+1)/1
a=2(√2+1)
P=a²
P=[2(√2+1)]²
P=4(2+2√2+1)
P=4(3+2√2)