Question

A road 3.5m wide surrounded a circular plot whose circumference is 44m.find the cost of paving road ofrup20perm2

Answer 1

Answer:

Rs. 4620

Step-by-step explanation:

Given :- The circumference of the plot,2πr = 44 m and the width of the road = 3.5 m

∴ radius of the plot = 44/2π = 7 m

Now,

The length of the road = the circumference on the outer side = 2π(r+3.5 m) = 2×22/7×10.5 m = 66 m                                                                                              And, the width of the road = 3.5 m

∴ the area of the road to be paved = 66×3.5 = 231 m²

∵ the rate of paving = Rs.20/m²

∴ total cost of paving = Rs (20×231) = Rs. 4620

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