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P=7
a²/2=7 |*2
a²=14
a=√14
z Tw. Pitagorasa
a²+a²=x²
(√14)²+(√14)²=x²
14+14=x²
x²=28
x=2√7
Ob=2a+x
Ob=2√14+2√7
Odp: obwód wynosi 2√14+2√7