# Intermediate Geometry : How to find the volume of a cube

## Example Questions

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### Example Question #41 : Solid Geometry

A cube has edges that are three times as long as those of a smaller cube. The volume of the bigger cube is how many times larger than that of the smaller cube?

Explanation:

If we let  represent the length of an edge on the smaller cube, its volume is .

The larger cube has edges three times as long, so the length can be represented as . The volume is , which is .

The large cube's volume of  is 27 times as large as the small cube's volume of .

### Example Question #1 : How To Find The Volume Of A Cube

The side length of a cube is  inches.

What is the volume?

Explanation:

The volume of a cube is

So with a side length of 7 inches, the volume is

### Example Question #2 : How To Find The Volume Of A Cube

The side length of a cube is  ft.

What is the volume?

Explanation:

The volume of a cube is

So with a side length of 2 ft, the volume is

### Example Question #1 : How To Find The Volume Of A Cube

Find the volume of a cube with an edge length of

Explanation:

The volume of a cube can be determined through the equation , where  stands for the length of one side of the cube. The equation is  because all edges in a cube are the same length. The value for the given edge just needs to be substituted into the equation for  in order to solve for the cube's volume.

### Example Question #2 : How To Find The Volume Of A Cube

If the side of a cube is  in length, what is the volume of the cube?

Explanation:

To find the volume of a cube we just multiply a length of one of the cube's sides by itself three times, or in other words, cube it. If we call the length of a side of a cube , then:

The side of our cube is  in length, so we can substitute this into the equation and solve:

### Example Question #42 : Solid Geometry

A Rubik's Cube is made up of three square layers, with nine identical smaller cubes in each layer. If one of the smaller cubes has side lenghts of 1.5 cm, what is the approximate volume of a whole Rubik's Cube?

Explanation:

This is a great problem becaue ther are two ways to approach it. The simplest way is to realize that because each edge of the Rubik's Cube is made up of 3 of the smaller cubes we can find the edge length for the whole Rubik's Cube:

(edge of whole Rubik's Cube)

Now that we know the edge length finding the volume is easy, we simply multiply the length, width, and height of the cube to find the volume.  This is easy because the length, width, and height are all 4.5 cm.

(vol. of Rubik's Cube)

This is the answer.  Another way to approach the problem would be by finding the volume of one of the smaller cubes, then multiplying by 9 to find the volume of one layer, then multiplying by three, because there are 3 layers.

(vol. of one small cube)

(vol. of one layer of Rubik's Cube)

(vol. of Rubik's Cube)

Two different methods and we got the same answer!

### Example Question #43 : Solid Geometry

A cylinder is cut out of a cube as shown by the figure below.

Find the volume of the figure.

Explanation:

In order to find the volume of the figure, we must first find the volumes of the cube and the cylinder.

Recall how to find the volume of a cube.

Plug in the given side length of the cube to find the volume.

Next, recall how to find the volume of a cylinder.

Use the given diameter to find the length of the radius.

Find the volume of the cylinder.

To find the volume of the figure, subtract the volume of the cylinder from the volume of the cube.

Make sure to round to  places after the decimal.

### Example Question #5 : How To Find The Volume Of A Cube

A cylinder is cut out of a cube as shown by the figure below.

Find the volume of the figure.

Explanation:

In order to find the volume of the figure, we must first find the volumes of the cube and the cylinder.

Recall how to find the volume of a cube.

Plug in the given side length of the cube to find the volume.

Next, recall how to find the volume of a cylinder.

Use the given diameter to find the length of the radius.

Find the volume of the cylinder.

To find the volume of the figure, subtract the volume of the cylinder from the volume of the cube.

Make sure to round to  places after the decimal.

### Example Question #45 : Solid Geometry

A cylinder is cut out of a cube as shown by the figure below.

Find the volume of the figure.

Explanation:

In order to find the volume of the figure, we must first find the volumes of the cube and the cylinder.

Recall how to find the volume of a cube.

Plug in the given side length of the cube to find the volume.

Next, recall how to find the volume of a cylinder.

Use the given diameter to find the length of the radius.

Find the volume of the cylinder.

To find the volume of the figure, subtract the volume of the cylinder from the volume of the cube.

Make sure to round to  places after the decimal.

### Example Question #46 : Solid Geometry

A cylinder is cut out of a cube as shown by the figure below.

Find the volume of the figure.

Explanation:

In order to find the volume of the figure, we must first find the volumes of the cube and the cylinder.

Recall how to find the volume of a cube.

Plug in the given side length of the cube to find the volume.

Next, recall how to find the volume of a cylinder.

Use the given diameter to find the length of the radius.

Find the volume of the cylinder.

To find the volume of the figure, subtract the volume of the cylinder from the volume of the cube.

Make sure to round to  places after the decimal.

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