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I przypadek
P2/P1=k^2
k=0,2
k^2=0,2^2=0,04 skala podobienstwa pól
P2=P1*k^2=20*0,04=0,8cm^2
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II przypadek
P1/P2=k^2
P2=P1/k^2=20/0,04=500cm^2