Question

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Answer 1

Răspuns:

Perimetru patrat=4a

Arie patrat=a^2

1) a=1cm => P=4cm A=1cm^2

2) a=12m => P=48m A=144m^2

3) a=1,5km => P=6km A=2.25km^2

4) P=8m => a=2m A=4m^2

5) P=2dm => a=0.5dm A=0.25dm^2

6) P=1m => a=0.25m A=0.0625m^2

7) A=1m^2 => a=1m P=4m

8) A=9km^2 => a=3km P=12km

9) A=1.21cm^2 => a=1.1cm P=4.4cm

Perimetru dreptunghi= 2l+2L

Arie dreptunghi= l×L

1) P=5×2+2×2=10+4=14cm A=5×2=10cm^2 ( ^2=puterea a doua )

2) L=1m=10dm

P=2×10+2×1=22dm A=10×1=10dm^2

3) L=0.5dm=5cm

P=2×5+2×3=10+6=16cm A=5×3=15cm^2

4) L=3m A=6m^2 => l=2m P=2×3+2×2=10m

5) L=8cm A=56cm^2 => l=7cm P=2×8+2×7=16+14=30cm^2

6) l=5dm A=1m^2=100dm => L=20dm P=2×5+2×20=10+40=50dm

7) l=40cm A=2m^2=20000cm^2 => L=500cm P=2×40+2×500=80+1000=1080cm