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Obw=0,83+0,83+1,65+1,65=4,96 [m]
b) 0,83+0,83=1,66 [m] (bok po przystawieniu ławek)
Obw=1,66+1,66+1,65+1,65=9,92 [m]
długość- 0,83+0,82=1,65m
a) Obw= 0,83m x 2 + 1,65m x 2 = 1,66 + 3,30= 4,96