Răspuns :
P patrat= 4 × l
P patrat= 4 × 15 dm
P patrat= 60 dm
A patrat= l × l
A patrat= 15 × 15
A patrat= 225 dm²
P patrat= 4 × 15 dm
P patrat= 60 dm
A patrat= l × l
A patrat= 15 × 15
A patrat= 225 dm²