Question

The area of a rectangle having breadth 20 centimetre is 1200 square centimetre what is the perimeter of the rectangle

Answer 1

area= L×b
1200=20L
1200/20=L
60=l

length is 60 cm

perimeter- 2(l+b)
P= 2(60+20)
P=2×80
p=160cm

Answer 2

l*b=area of a rectangle.
l*20=1200
l=1200/20=60cm
2*(l+b)=perimeter
2*(60+20)=perimeter
2*80=160cm square.
Hope it helps.