9. The area of a square is 81 m². Find the cost of fencing it 2 times at the rate of 7.50 per metre.
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Answer:
Area of square = a²
= 81 m²
a² = 81
a = 9 m
Side of Square = 9 m
Perimeter of Square = 4a
= 4 x 9 = 36 m
Cost of fencing once = perimeter x
rate of fencing
= 36 x 7.5
Cost of fencing it twice = 36 x 7.5 x 2
= 540
Answered by
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Area of square=81m²
√81=9
Now, fencing would be done on perimeter.
Perimeter=
Sides of square=4
=4×9=36
Cost of fencing/m=7.50
Cost of fencing of 36m= 7.50×36
=270
Fencing twice= 270×2
=540
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