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1. L=18cm l=jumătatea ei P dreptunghi =?cm.



Răspuns :

l = L/2 = 18/2 = 9 cm

P = 2(l + L) = 2(9 + 18) = 2 x 27 = 54 cm

L=18 cm

l=18:2

l=9

P=(2×L)+(2×l)=2×18+2×9=36+18=54