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a-2-krótszy bok prostokąta
a+6-dłuższy bok prostokąta
a²=(a-2)*(a+6)
a²=a²+6a-2a-12
a²-a²-6a+2a= -12
-4a=-12/:(-4)
a=3
pole kwadratu
P=a²
P=(3cm)²
P=9cm²