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Micsorand de 4 ori lungimea unui dreptunghi si de 3 ori latimea lui obtinem un patrat cu perimetrul de 12 cm. Calculati aria


Răspuns :

L/4=l/3
P=L/4+l/3=12cm
L/4+l/3=12cm
L/4+L/4=12cm
2L/4=12cm
L/2=12cm
L=12cm×2=24cm

l/3=L/4
l/3=24/4
l/3=6
l=6×3=18

A dreptunghi=L×l=23×18=432cm²