How to find the surface area of a cube

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Math › How to find the surface area of a cube

Questions 1 - 10
1

If the surface area of a cube equals 96, what is the length of one side of the cube?

4

3

6

5

Explanation

The surface area of a cube = 6a2 where a is the length of the side of each edge of the cube. Put another way, since all sides of a cube are equal, a is just the lenght of one side of a cube.

We have 96 = 6a2 → a2 = 16, so that's the area of one face of the cube.

Solving we get √16, so a = 4

2

Explanation

3

This figure is a cube with one face having an area of 16 in2.Cube

What is the surface area of the cube (in2)?

Explanation

The surface area of a cube is the sum of the area of each face. Since there are 6 faces on a cube, the surface area of the entire cube is .

4

One side of a cube is long. What is the surface area of the cube?

Explanation

To find the surface area of a cube, we find the area of a face by multiplying two of its sides together; then, we multiply by , since a cube has six faces. So, if is the length of one side of a cube, then the cube's surface area can be represented as .

We know that for this problem, , so we can substitute this value into the equation and solve for the cube's surface area:

5

What is the surface area of a cube with a volume ?

Explanation

To solve this, first calculate the side length based on the volume given. Recall that the equation for the volume of a cube is:

, where is the side length.

For our data, this gives us:

Taking the cube-root of both sides, we get:

Now, use the surface area formula to compute the total surface area:

, where is the length of a side of the cube. This equation is easy to memorize because it is merely a multiplication of a single side () by because a cube has equal sides.

For our data, this gives us:

6

What is the surface area of a cube with a volume ?

Explanation

To solve this, first calculate the side length based on the volume given. Recall that the equation for the volume of a cube is:

, where is the side length.

For our data, this gives us:

Taking the cube-root of both sides, we get:

(You will need to use a calculator for this. If your calculator gives you something like . . . it is okay to round. This is just the nature of taking roots!).

Now, use the surface area formula to compute the total surface area:

, where is the length of a side of the cube. This equation is easy to memorize because it is merely a multiplication of a single side () by because a cube has equal sides.

For our data, this gives us:

7

What is the surface area of a cube with a side length of ?

Explanation

In order to find the surface area of a cube, use the formula .

8

The side length of a particular cube is . What is the surface area of this cube?

Explanation

To find the surface of a cube, use the standard equation:

where denotes the side length.

Plug in the given value for to find the answer:

9

A cube has a sphere inscribed inside it with a diameter of 4 meters. What is the surface area of the cube?

None of these

Explanation

Since the sphere is inscribed within the cube, its diameter is the same length as an edge of the cube. Since cubes have identical side lengths we find the area of one side and then multiply by the number of sides to find the total surface area.

Area of one side:

Total surface area:

10

If a side of a cube has a length of , what is the cube's surface area?

Explanation

Write the formula to find the surface of a cube, where is the length.

Substitute and solve.

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