Area of circle (i) when r = 8 cm = πr12 = π64 = 64π Area of circle (ii) is where r = 9 cm = πr22 = 81π Area of path (r2−r1) = 81π − 64π = 17π
According to the given statement, Area of circle (iii) = 81π +17π = 98π Now area of the circle = πr2 98π = πr2 r2 = 98 r = 7√2 cm