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12m:4=3m
P=a*a
P=3m*3m
P=9m²
Ad2.
360m:4=90m
P=a*a
P=90m*90m
P=8100m²
8100m²=81a
Proszę. . . i licze na najlepsze;)
3m x 3m = 9m²
360m : 4 = 90m
90m x 90m = 8100m2
8100m2 : 100 = 81ar