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√900m²=30m
Obw.=30m*4=120m
zad.2
64cm²/4cm=16cm
p=900m²
a=√900m²
a=30m
O=4a = 30m*4=120m
Obwód wynosi 120m
2.
P. prost. = a*b
a=4cm
64cm²:4cm=16cm
Drugi bok ma 16 cm