Question

The perimeter of a square field in 8 km. Find its area in hectares.

Answer 1

Given perimeter of square field is 8 km

let 'a' be its side

then perimeter = 4a = 8km

[a = 2km]

we know 1 hectares =0.01(km)²

area of filed = a² 

= 4km²

then area of hectare = 400/0.01​ = 40000 hectares.

Answer 2

Given that 
The perimeter of square = 8 km 

4*side = 8 km

side = 8/4 km

side = 2 km

Area of the Square = side*side

Area of the Square = 2 km * 2 km

Area of the Square = 4 km²

We know that 1 km = 100 Hectare 

then 

Area of the Square = 4*100*100 km²

Area of the Square = 4*10⁴ km²