Question

the diameter of a circular Park is 84 on its outside there a 3.5 wide road find the cost of constructing the road at rupees 240 per metre

Answer 1

radius of the park = 84/2 = 42m
area of the park = (22/7)×42×42 = 5544m^2
width of road = 3.5m
.•.total radius = 3.5+42 = 45.5m
total area = (22/7)×45.5×45.5 = 6506.5m^2
area cover by the road=6506.5-5544= 962.6
total cost of constructing the road=962.5×240=Rs231000