Given: Area of square =484cm2 Formula Used: Area of square = side × side Diagonal = √2 × side Calculation Area of square = side × side ⇒ √484 = side ⇒ 22 cm = side Diagonal = √2 × side ⇒ Diagonal = √2 × 22 ⇒ Diagonal = 22√2 cm ∴ The length of the diagonal is 22√2 cm. The correct option is 4 i.e.22√2 cm.