Question

The perimeter of a rectangular field is 840 m. if it's breadth is 20 then find it's area​

Answer 1

Perimeter = 840m

Given breadth(b)=20m

Perimeter of rectangle=2(l+b)

840=2(l+20)

840=40+2l

800=2l

so

length=400m

Area of rectanlge= l*b

                            = 400*20

                            = 8000 sq.m

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Answer 2

Answer:

PERIMETER OF RECTANGLE- 2(L+B)

2(L+20)= 840 M

2L+40= 840 M

2L= 840-40= 800 M

L= 800/2= 400 M

AREA= L x B

800 x 20= 16000sq cm

Step-by-step explanation:

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