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L=7m
P=22m
A=?
l=?
Aflati aria !!!


Răspuns :

P=2L+2l=22⇒7×2+2l=22
2l=22-14
l=8/2=4
A=L×l=7×4=28
P = 22 =2L + 2l => l = (22-2L) : 2 = (22 - 14) : 2 = 8 : 2 = 4 m
A = l x L = 4 x 7 =28 m²