Question

the total surface area of a cube is 486 sq cm it's diagonal is​

Answer 1

Answer:

9√3

Step-by-step explanation:

as surface area of a cube is 6a²

∴ 6a² = 486

⇒ a = √81

⇒ a = 9

Length of diagonal of a cube is = √3 a

⇒ √3 × 9

⇒ 9√3

HOPE IT HELPS