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A square tank has an area of 1600m2.There are four semlcircular plots around it.Find the cost of turfing the plots at Rs 1.25per m2.

Posted by Zeeshan Jameel 6 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 2 months ago

Area of square = 1600 m²
length of side, l = √1600 = 40m
so diameter of semicircles = length of side of square = 40m
radius, r = 40/2 = 20m
Area of one semicircle = {tex}\frac{ \pi r^2}{2} = \frac{22*20^2}{7*2} =628.57\ m^2{/tex}

Area of all 4 semicircles = 4×628.57 = 2514.28 m²

total area = 2514.28+1600 = 4114.28
rate = Rs. 1.25 per m²
total cost = 1.25×4114.28 = Rs. 5142.85

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