Sum

A square water tank has its side equal to 40m, there are 4 semicircular flower beds grassy plots all around it. Find the cost of turfing the plot at Rs 1.25/sq.m

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#### Solution

Side of water tank = 40m

Grassy plot is semicircular with radius =`(side)/2=40/2`= 20๐ = ๐

Area of grassy plot = 4(area od semicircular grassy plot with radius 20m)

`= 4 [1/2`(๐๐๐๐ ๐๐ ๐๐๐๐๐๐ ๐ค๐๐กโ ๐๐๐๐๐ข๐ )]

`= 4 ×1/2× pi(20)^2`

= 2 × 20 × 20 × ๐ = 800๐ ๐^{2}.

Cost of turfing 1m2 = Rs. 1.25

Total cost of turfing the grassy plot around tank

= 800๐ × 1.25

= 1000๐

= 1000 × 3.14

= Rs. 3140

Concept: Circumference of a Circle

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