Question

cate hectare are o suprafata in forma de patrat cu latura de 20 metri

Answer 1

Aria = $20^{2}$ = 400$m^{2}$
1 hectar = 10.000 $m^{2}$ => Aria = 400 / 10.000 = 0,04 ha

Answer 2

A patrat=l²
⇒A patrat=20²m²
⇒A patrat=400m²
⇒400m²=4dam²=0,04hm²=0,04ha;