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1stopa=12cali=12*2,54cm=30,48cm
1cal^2=(2,54cm)^2=6,4516cm^2
1stopa^2=(30,48cm)^2=929,0304cm^2
P=36cm^2
x=4mm=0,4cm
y=?
P=x*y
36cm^2=0,4cm*y
y=36cm^2/0,4cm=90cm
A. 0,5ha=5000m^2
B. 60a=6000m^2
C. 7000m^2
D. 0,04km^2=4ha=40000m^2
Odp.D :)