Total surface area of a cube is 486 sq cm, find sum of length of all its edges?

216 cm 108 cm 171.5 cm 162 cm

108 cm

Total surface area of a cube = 6a2 = 486 ⇒ a2 = 81 ⇒ a = 9 Sum of edges = 12a = 12 × 9 = 108 cm