Question

The perimeter of a rectangular field is 160 m. Find the area of the field, if it's breadth is 20 m.​

Answer 1

perimeter =2(l+b)

160=2l+2×40

160=2l+80

160-80=2l

80/2=l

l=40

area=lb

=40×40

1600msq

Answer 2

Answer:

Perimeter of rectangular field=2(l+b)

160=2(l+20)

160=2l+40

120=2l

l=60m

Area of rectangular field=l×b

=60m×20m

=1200m²