A =60m^2 =60*10^2*2 =60*10^4 =600000 cm^2
A =L* l
a) l=6m =600 cm
600000=L*600 => L =600000:600 =1000 cm
b) l =30 dm =300 cm
600000 =L*300 => L =600000:300 =2000cm
c) l =0.05hm =0.05*10^4 =500 cm
600000 =L *500 => L =600000:500 =1200 cm
d) l =0.004 km =0.004 *10^5 =