Question

the area of a square field is 400 hectares. find, in metres, it's side and it's perimeter

Answer 1

1 Hectare = 10,000 m²
400 hectares = 400 x 10,000 = 4,000,000m²

It's side = √4,000,000 = 2,000 m

Perimeter = 2,000 x 4 = 8,000 m