The length of a rectangular field is four times its breadth. Its area is 400 square metre, then find its perimeter.
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L=x
B=4x
A=400
A=l *b
400= 4x *x
400=4x^2
100=x^2
X=10
L=40
B=10
B=4x
A=400
A=l *b
400= 4x *x
400=4x^2
100=x^2
X=10
L=40
B=10
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