Subject
Quantitative Aptitude
Topic
Mensuration
The area of a circular field is 3850m2. Find the cost of fencing the field at Rs.4 per meter.
The area of a circular field is 3850m2. Find the cost of fencing the field at Rs.4 per meter.
ক)
Rs. 889.85খ)
Rs. 808গ)
Rs. 880ঘ)
Rs. 885.6ঙ)
None of theseExplanation
Area = 3850m2 We know that area of a circle = πr 2 , where r is the radius of the circle Therefore, 3850 = πr 2 22/7 r 2 = 3850 (taking π = 22/7) r 2 = (3850 × 7)/22 r 2 = 1225 r = 35 m We know that the cost of fencing = perimeter of the field × cost per meter Perimeter of the field = 2 π r = 2 × 22/7 × 35 [perimeter of circle = 2 π r] = 220 m Therefore the cost of fencing = Rs. (220 × 4) = Rs. 880 Hence, the cost of fencing the field is Rs. 880.Related questions
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