Answer:
Option (3)
Explanation:
Formula to calculate the surface area of a cardboard box in the shape of a cube is,
Surface area = 6(Side)²
If the length of the each side of the box is = 3 feet
Surface area of the cube = 6(3)²
= 6 × 9
= 54 square feet
Therefore, Surface area of the box in the shape of a cube is 54 square feet.
Option (3) is the correct option.