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k=5/3
P'/P=k² stosunek pól to kwadrat skali podobieństwa
P'P=(5/3)² =25/9
P=P' :k²
P=900 :25/9 =900*9/25 =36*9
P=324
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P'=30 cm²
P=P' : k²
P=30 *9/25=1,2*9
P=10,8