Răspuns :
5m =500 cm
4m =400 cn
A =L* l
A =500*400 =200000 cm ^2
S dalei =40*40 =1600 cm^2
200000: 1600 = 125 dale
4m =400 cn
A =L* l
A =500*400 =200000 cm ^2
S dalei =40*40 =1600 cm^2
200000: 1600 = 125 dale