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ABCD=Dreptunghi,L,l=d.p(7,3),p=120cm.Aflati aria dr

Răspuns :

L/7=l/3=L+l/7+3=L+l/10=120/10=12

L/7=12 ⇒L=12·7=84 cm
l/3=12 ⇒ l=12·3=36 cm

A=L·l
A=84·36=3024 cm²