Correct Answer - Option 1 : 180 cm
Given
Lateral surface area = 900 sq.cm
Formula used
Lateral surface area = 4(side)2
Sum of all edges = 12 × side [As there are 12 edges of a cube]
Calculation
Lateral surface area = 900
4(side)2 = 900
⇒ (Side)2 = 225
⇒ (Side) = 15
Total rope required to cover all edges = 15 × 12
⇒ 180 cm
∴ Total length of rope required is 180 cm