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a+2
d=a√2
a+2=a√2
a√2-a=2
a(√2-1)=2 /*(√2-1)
a=2/(√2-1) usuwamy niwymierność z ułamka
a=2√2+2
pole
(2√2+2)²= 8+8√2+4=12+8√2
teraz jest ok