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2015-10-15T14:46:35+05:30

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Hey Priyanka! I hope you know how the diagram for this question will be.

The outer radius of path R= 42/2= 21m
width of path = 3.5m
the inner radius of path r=21-3.5=17.5m

Area of path = area of outer circle - area of inner circle
                   = πR² - πr²
                   = π×21² - π×17.5²
                   =423.115 m²
Price @rs.2 per m² = 423.115*2 = Rs. 846.23

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diameter in place of radius?
sorry sorry...did it by mistake
It is correct now!
2015-10-15T14:46:35+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
We need to find the area of the circular path.  This is equal to the difference between the areas of circle of radius 42/2 = 21 m  and  21 - 3.5m = 17.5 m.

Area of circular path = π (21²  - 17.5²) = π * 7² * 2.75  m²  = 423.33 m²

Cost of laying the road = area * rate = Rs  269.5 π  = Rs  846.66 


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