Question

1. Calculati perimetrul unui dreptunghi stiind ca:
a). are aria 50m² si lungimea 10m.
b). are aria 25,2m² si latimea 28dm.
2. Calculati perimetrul unui patrat care are aria 25m².
Va rog cat mai repede si corect!

Answer 1

Adreptunghi=lungimea × latimea

a). are aria 50m² si lungimea 10m.
latimea 50:10=5 m
P=2×(10+5) =30 m

b). are aria 25,2m² si latimea 28dm.
28 dm = 2,8 m
lungimea 25,2:2,8=9 m
P=2×(9+2,8) =23,6 m

2. Calculati perimetrul unui patrat care are aria 25m².
A=L²=25 m²
L=√25=5
P=4x5=20 m