[tex]\huge\underbrace\red{Answer}[/tex]
Perimeter of the square = 4 × side
By substituting values,
⇒ 4 × 70m
➥ 280m
Perimeter of the rectangle = 2( length + Breadth)
By substituting values,
⇒ 2( 90m + 60m )
⇒ 2( 150m)
➥ 300m
Difference between perimeters of fields = Perimeter of Rectangular field - perimeter of square field
By substituting values,
⇒ 300m - 280m
➠ 20m