What is the diameter of the largest circle lying on the surface of a sphere of surface area 616 sq cm?

Surface area of sphere = 6616 cm²
4πr² = 6166
⇒r² = (6166 x 7)/(4 x 22)
⇒ r² = 7 x 7
⇒ r = 7 cm
∴ Diameter of largest circle lying on sphere = 2 x r = 2 x 7 = 14 cm