Question

the area of a circular field is 13.86 hectares find teh cost of fencing it at the rate of 4.25 per meter​

Answer 1

As per the data given in the question,

In the above question, it is given that,

The area of a circular field is 13.86 hectares

cost of fencing 4.25 per meter​.

We have to find the cost of fencing.

Area of the circle is $=2\pi r$

$\begin{array}{l}\text { Area }=(13.86 \times 10000) \mathrm{m}^{2}=138600 \mathrm{~m}^{2} . \\\pi \mathrm{R}^{2}=138600 \\(\mathrm{R})^{2}=(138600 \times(7 / 22)) \\\mathrm{R}=210 \mathrm{~m} .\end{array}$

Therefore the circumference will be $=2\pi r$

$2 \pi R=(2 \times(22 / 7) \times 210) m\\=1320 m .$

Thus the cost of fencing will be circumference into rate of fencing per meter,

$\text { Cost of fencing }=\text { Rs. }(1320 \times 4.25)=\text { Rs. } 5610$