Răspuns: A = 120 000 m² = 1200 dam² = 12 hm²
Aria dreptunghiului = Lungime x latime
L ungime = 400 m = 40 dam = 4 hm
latime = 300 m = 30 dam = 3 hm
aria in m²= 400 m x 300 m = 120 000 m²
aria in dam² = 40 dam x 30 dam = 1200 dam²
aria in hm² = 4 hm x 3 hm = 12 hm²