Question

6 A cube has a surface area of 54 mm². The length of its sides is: A 3 mm B 4 mm C 5

mm D 6 mm E 7 mm

Answer 1

A

Explanation:

A cube has 6 square faces

given surface area = 54 mm² , then

area of one face = 54 mm² ÷ 6 = 9 mm²

the area (A) of a square is calculated as

A = s² ( s is the side length ) , so

s² = 9 ( take square root of both sides )

s =
`√(9)` = 3 mm