Find the perimeter of a rectangular field whose length is 4 times its width and which has area equal to 20736 sq.m.
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Answer:
let width be x
length = 4x
Area = l x b
20736 = x * 4x
20736 = 4x²
20736/4 = x²
5184 = x²
x = 72
width = 72m
length = 72 x 4 =288m
perimeter of rectangle = 2(l+b)
= 2 (72+288)
= 2 x 360
= 720 m
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