Maths-

General

Easy

Question

# If the area of 1 face is 81 how much is the surface area of the whole cube?

- 486
- 9
- 81
- 324

Hint:

### Total Surface Area of Cube: The total surface area of a cube refers to the total area covered by all six faces of a cube. To calculate the surface of a cube, we find the sum of the areas of these 6 faces.

Surface Area = 6a2

= 6 (area of face)

where a is the side of cube

## The correct answer is: 486

- Step 1:We have given area of one face of the cube.

Area of face = 81

- Step 2: For total surface area, find out the product of the square of side length by 6.

Surface area = 6 (area of face)

= 6 (81)

= 486

- Step 4: Therefore, the surface of the given cube is 486.
- Therefore, the correct answer is option A) 486 .

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