Question

a rectangular field is to be fenced on three sides, leaving a side of 20 cm uncovered. if the area of the field is 680 metre square how many metre of fencing is required?

Answer 1

Length=Area/breadth=680/20=34 m
Meter of fencing= (34x2)+20=68+20=88m
Therefore,88 meter of fencing is required.

Answer 2

Answer:

Length of the fencing = 88 m

Explanation:

Dimensions of a Rectangular field :

Length = l m

breadth (b) = 20m

i )Area of the field = 680m²

=> l × b = 680 m²

=> l = $\frac{680m^{2}}{20m}$

=> l = 34 m ---(1)

ii ) If the field is fenced on three sides, leaving one side uncovered,

then

length of the fencing = 2l+b

= 2×34+20

= 68+20

= 88 m

Therefore,

Length of the fencing = 88 m

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