Surface area of a sphere = 4πr²

Given, surface area is 154 cm²

⇒ 4 × (22/7) × r² = 154

⇒ r² = 49/4

⇒ r = 3.5 cm

Volume of a sphere = (4/3)πr³

⇒ Volume of the given sphere = (4/3) π × 3.5³ = 179.66 cm³