ABC26GN4275 · Area
Subject: General Aptitude · Chapter: Area · Exam: 2010 · Marks: · Difficulty:
The area of a circular field is 13.86 hectares. Find the cost of fencing it at the rate of ` 4.40 per metre.
Answer
Explanation
Area $=(13.86 \times 10000)\ \text{m}^2=138600\ \text{m}^2$. $\pi R^{2}=138600 \Leftrightarrow R^{2}=\left(138600 \times \frac{7}{22}\right) \Leftrightarrow R=210\ \text{m}$. Circumference $=2\pi R=\left(2 \times \frac{22}{7} \times 210\right)\ \text{m}=1320\ \text{m}$. $\therefore$ Cost of fencing $=₹(1320 \times 4.40)=₹5808$.
Explanation as extracted from the printed page; notation may be imperfect.
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