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calculati perimetrul unui dreptunghi stiind ca:
are aria 50 m patrati si lungimea 10 metri


Răspuns :

A=L×l=10×l=50⇒l=50/10=5 m            
P=2(l+l)=2(10+5)=2×15=30 m
Ad=50m²
L=10m

Ad=Lxl 
50=10xl
l=50:10
l=5

Pd=2xL+2xl
Pd=2x10+2x5
Pd=20+10
Pd=30m