Question

A part of which 3.5 M runs all around a circular coil having an area of 962 . 5 m square find the area of the path

Answer 1

Area of circle =962.5
22/7*(r2)=962.5
r2=962.5*7/22
r2=43.75*7
r2=306.25
r=17.5m
New radius =17.5+3.5=21m
Area of path =22/7*(R2-r2)
Area of path =22/7*(21*21-17.5*17.5)
Area of path =22/7*(441-306.25)
Area of path =22/7*134.75
Area of path =22*19.25=423.5m2