The area of a rectangular field is 1600sqm. If the length of the field is 80m, find the perimeter of the field.

Given:

Area of field = 1600 sq.m

Length of field = 80 m

Area = l × b

b = 1600 / 80

= 20 m

Perimeter = 2 × (l + b)

= 2 × (80 + 20)

= 200 m.