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Question
A rectangular farmland of length 40 m has an area of 800 square metres. Find the total length of the wire used to fence the farmland if it is rounded thrice the boundary.
A rectangular farmland of length 40 m has an area of 800 square metres. Find the total length of the wire used to fence the farmland if it is rounded thrice the boundary.
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Solution
The correct option is A 340 m
Area of the rectangular farmland = 800 sq.m
Length of the farmland = 40 m
So, breadth of the farmland = 800 / 40 = 20 m
Now,
Perimeter of the farmland = 2 x (length + breadth)
= 2x ( 40 + 20) = 120 m
Length of the wire required = 3 x perimeter of the farmland
= 3 x 120 m = 360 m
Area of the rectangular farmland = 800 sq.m
Length of the farmland = 40 m
So, breadth of the farmland = 800 / 40 = 20 m
Now,
Perimeter of the farmland = 2 x (length + breadth)
= 2x ( 40 + 20) = 120 m
Length of the wire required = 3 x perimeter of the farmland
= 3 x 120 m = 360 m
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