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प्रश्न
A square tank has an area of 1600 cm2. There are four semicircular plots around it. Find the cost of turfing the plots at Rs 12.50 per m2
उत्तर
Let a m be the side of the square.
Area of the square
= a2
Thus, we have :
a2 = 1600
⇒ a = 40
Area of the plots = 4(Area of the semicircle of radius 20 m)
`=|4(1/2pi"r"^2)"m"^2|`
`=|4(1/2xx3.14xx20xx20)|"m"^2`
= 2512 m2
∴ Cost of turfing plots at 12.50 per m2 = Rs (2512 × 12.50)
= Rs 31400
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