Question

Rezolvati de la 3 pana la 6, varog frumos. URGENT

Answer 1

Răspuns:

3.

6 dm=60 m

P=60×4=240 m

A=60×60=3600 m2

4. P=14 m

l=14÷2

l=7 m

A=7×7=49 m2

5.L=80 cm=8 dm

A=40 dm2

A=L×l

l=40÷8=5 dm

P=L×2+l×2

P=8×2+5×2

P=16+10

P=26 dm

6.P=30cm

L=l×2

P=L×2+l×2=30 cm

P=l×4+l×2=30cm

l×6=30cm

l=30÷6=5 cm

L=5×2=10 cm

A=10×5=50 cm3