Question

In a rectangular field, the difference of two adjacent sides is 5 m and the length of diagonal is 25 m. Then, find the cost of fencing it at the rate of `4 per metre.

Answer 1

Answer:

Correct option is D)

Let the length of he field be x m then, width of the field =(x+3)m

Then, x

2

+(x+3)

2

=15

2

...By Pythagoras theorem

so x

2

+3x−108=0

∴ Rejecting the negative value, length = 9 m

∴ Width = 12 m

Area of the field = 12×9=108m

2

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