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Dau Coroana...URGENT ...ex 11 (a si b)

Dau CoroanaURGENT Ex 11 A Si B class=

Răspuns :

a) l*L=50m patrati
L=10m
l=50:10=5m
Perimetrul=2*10+2*5=20+10=30m
b)l*L=25,2m patrati
l=28dm; 10dm=1m
l=28:10=2,8m
L=25,2:2,8=9m
Perimetrul=2*2,8+2*9=5,6+18=23,6m