Question

the radius of a circular field is 140 cm It is surrounded by a path of uniform width of 7 M find the area of path and the cost of levelling it at Rs 5 per square metre​

Answer 1

Given,
radius of circular park = 140 cm
Area of park = πr²
=> 22/7×140×140
=> 61600
Radius of park along with path = (140+7) = 147m
Area of park = πR²
=> 22/7×147×147
=> 67914
Area of path = ( R - r )
=> 67914-61600
=> 6314 m²
cost of levelling the path = (6314×5) = 31570

The area of path is 6315 m² and the cost of levelling the path is Rs. 35170