Question

a circular park of radius 30m has a traxk of with 2.5m on its inner side. find the area of the track

Answer 1

Area of outer circle= Pi r^2
                              = 3.14 X 30 X 30 
                              = 2826 m^2
Area of inner circle= Pi r^2
                              = 3.14 X 27.5 X 27.5           ( radius= 30-2.5)
                              = 2365.205 m^ 2
Area of track          = Area of Outer circle - Area of Inner circle
                              = 2826 - 2365.205
                              = 460.795 m^2