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powierzchnia to wymiar liniowy do kwadratu i zwiększamy ją (4*10^4)^2=16*10^8
P:P'=1:40000
P'=P*(4*10^4)^2= 125*(4*10^4)^2=125*16*10^8=2000*10^8 mm^2
P'=2*10^11 mm^2=2*10^11*10^-6 m^2=2*10^5 m^2
1 a=10^2 m^2
P'=2*10^5/10^2=2*10^3 a 1
1 ha= 10^4 m^2
P'=2*10^5/10^4=20 ha
1 km^2= 1000^2 m^2=10^6 m^2
P'=2*10^5/10^6=2*10^-1=0,2 km^2
2) 37 mm^2=37*10^-6 m^2=3,7*10^-5 m^2
P:P'=1:750000
P=P'*(7,5*10^5)^2=3,7*10^-5*56,25*10^10=3,7*56,25*10^3=20812500 m^2
P'= 20812500/100=208125 a
P'= 208125/10^4=2081,25 ha
P'= 208125/10^6=20,81 km^2