Question

Calculati aria unui patrat ce are perimetrul egal cu:
a)20 m
b)12 mm
c)3,4 dm
d)5,24 m
e)14,4 dam
f)1 km
Ajutatimaaa va rog,imi trebuie imediat!!!! :(

Answer 1

[tex]a) P=20m \\ P=4*l \\ 20 m=4l \\ l=20m:4 \\ l=5m \\ A= l^{2} \\ A= (5m)^{2} =25 m^{2} \\ b) P=12 mm \\ 12mm=4l \\ l=12mm:4 \\ l=3mm \\ A=(3mm)^{2}=9mm^{2} \\ c) P=3,4dm \\ 3,4dm=4l \\ l=3,4dm:4 \\ l=0,85dm \\ A=(0,85dm)^{2}=0,7225dm^{2} \\ d)P=5,24m \\ 5,24m=4l \\ l=5,24m:4 \\ l=1,31m \\ A= (1,31m)^{2}=1,7161 m^{2} \\ e) P=14,4dam \\ 14,4dam=4l \\ l=14,4dam:4 \\ l=3,6dam \\ A= (3,6dam)^{2}=12,96 dam^{2} \\ f) P=1km \\ 1km=4l \\ l=1km:4 \\ l=0,25km \\ A= (0,25km)^{2}=0,0625 km^{2}[/tex]