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3)ABCD dreptunghi
Perimetrul=128 cm
Lungimea=3 x latimea
Aria?


Răspuns :

P=2*l+2*L=2l+6l=8l=128 l=16 L=48 A=16*48=768
128=2L+2l
L=3l
128=8l/8
l=16cm
L=3*16=48cm
A=L*l=16*48=768