Question

Find the side of cube whose total surface area is 486 sq.cm

Answer 1

9 cm

Explanation:

The cube has 6 square faces.

Divide surface area by 6 to find area of 1 face

area = 486 ÷ 6 = 81 cm²

The area of a square = s² ( s is the side length ) , then

s² = 81 ( take the square root of both sides )

s =
`√(81)` = 9 cm