a = 0,8 km = 0,8 * 1000m = 800 m
b = 0,4 km = 400 m
h = 15 m
Pp=ab=800*400=320000[m^2]
Pb=2ah+2bh=2*800*15+2*400*15=24000+12000=36000[m^2]
P_c=Pp+Pb=320000+36000=356000[m^2] folii <–odpowiedź 1
1 ha = 10 000 m^2, czyli 1m^2=\frac{1}{10000}ha
Pp=320000m^2=320000*\frac{1}{10000}ha=32ha <–odpowiedź 2