Correct Answer - Option 2 : 484 cm

^{2}
**Given**

Total surface area of cube = 726 cm^{2}

**Formula used **

Total surface area of cube = 6(side)^{2}

Curved surface area of cube = 4(side)^{2}

**Calculation**

6(side)^{2}= 726

⇒ (Side)^{2} = 726/6

⇒ (Side)^{2} = 121

⇒ Side = 11 cm

Curved surface area = 4(11)^{2}

⇒ 4 × 121

⇒ 484 cm^{2}

**∴ The curved surface area of a cube is 484 cm**^{2}