Total surface area of a cube is 486 sq cm, find sum of length of all its edges?
Answer & explanation
Correct answer: option 2
Total surface area of a cube = 6a2 = 486
⇒ a2 = 81
⇒ a = 9
Sum of edges = 12a = 12 × 9 = 108 cm
Total surface area of a cube is 486 sq cm, find sum of length of all its edges?
Correct answer: option 2
Total surface area of a cube = 6a2 = 486
⇒ a2 = 81
⇒ a = 9
Sum of edges = 12a = 12 × 9 = 108 cm