Cubes

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Geometry › Cubes

Questions 1 - 10

A sphere with a radius of is cut out of a cube that has a side edge of . What is the volume of the resulting shape?

Explanation

Since the cube is bigger, we will be subtracting the volume of the sphere from the volume of the cube.

Start by recalling how to find the volume of a sphere.

$\text{Volume of Sphere}=\frac{4}{3}\pi r^3$

Plug in the given radius to find the volume.

$\text{Volume of Sphere}=\frac{4}{3}\pi(2)^3=\frac{32}{3}\pi$

Next, recall how to find the volume of a cube:

$\text{Volume of Cube}=(\text{edge})^3$

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

$\text{Volume of Cube}=4^3=64$

Finally, subtract the volume of the sphere from the volume of the cube.

$\text{Volume of Figure}=64-\frac{32}{3}\pi=30.49$

Make sure to round to places after the decimal.

A sphere with a radius of is cut out of a cube that has a side edge of . What is the volume of the resulting shape?

Explanation

Since the cube is bigger, we will be subtracting the volume of the sphere from the volume of the cube.

Start by recalling how to find the volume of a sphere.

$\text{Volume of Sphere}=\frac{4}{3}\pi r^3$

Plug in the given radius to find the volume.

$\text{Volume of Sphere}=\frac{4}{3}\pi(2)^3=\frac{32}{3}\pi$

Next, recall how to find the volume of a cube:

$\text{Volume of Cube}=(\text{edge})^3$

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

$\text{Volume of Cube}=4^3=64$

Finally, subtract the volume of the sphere from the volume of the cube.

$\text{Volume of Figure}=64-\frac{32}{3}\pi=30.49$

Make sure to round to places after the decimal.

A sphere with a radius of is cut out of a cube that has a side length of . What is the volume of the resulting figure?

Explanation

Since the cube is bigger, we will be subtracting the volume of the sphere from the volume of the cube.

Start by recalling how to find the volume of a sphere.

$\text{Volume of Sphere}=\frac{4}{3}\pi r^3$

Plug in the given radius to find the volume.

$\text{Volume of Sphere}=\frac{4}{3}\pi(1)^3=\frac{4}{3}\pi$

Next, recall how to find the volume of a cube:

$\text{Volume of Cube}=(\text{edge})^3$

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

$\text{Volume of Cube}=5^3=125$

Finally, subtract the volume of the sphere from the volume of the cube.

$\text{Volume of Figure}=125-\frac{4}{3}\pi=120.81$

Make sure to round to places after the decimal.

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

$V = 2^{3}, ft^3 = 8, ft^3$

If the surface area of a cube is , find the length of one side of the cube.

$6\sqrt2$

$8\sqrt3$

Explanation

Recall how to find the surface area of a cube:

$\text{Surface Area}=6(\text{side length})^2$

Since the question asks you to find the length of a side of this cube, rearrange the equation.

$\text{side length}^2=\frac{\text{Surface Area}}{6}$

$\text{side length}=\sqrt{\frac{\text{Surface Area}}{6}}$

Substitute in the given surface area to find the side length.

$\text{side length}=\sqrt{\frac{96}{6}}$

Simplify.

$\text{side length}=\sqrt{16}$

Reduce.

$\text{side length}=4$

A sphere with a radius of is cut out of a cube that has a side length of . What is the volume of the resulting figure?

Explanation

Since the cube is bigger, we will be subtracting the volume of the sphere from the volume of the cube.

Start by recalling how to find the volume of a sphere.

$\text{Volume of Sphere}=\frac{4}{3}\pi r^3$

Plug in the given radius to find the volume.

$\text{Volume of Sphere}=\frac{4}{3}\pi(1)^3=\frac{4}{3}\pi$

Next, recall how to find the volume of a cube:

$\text{Volume of Cube}=(\text{edge})^3$

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

$\text{Volume of Cube}=5^3=125$

Finally, subtract the volume of the sphere from the volume of the cube.

$\text{Volume of Figure}=125-\frac{4}{3}\pi=120.81$

Make sure to round to places after the decimal.

If the surface area of a cube is , find the length of one side of the cube.

$6\sqrt2$

$8\sqrt3$

Explanation

Recall how to find the surface area of a cube:

$\text{Surface Area}=6(\text{side length})^2$

Since the question asks you to find the length of a side of this cube, rearrange the equation.

$\text{side length}^2=\frac{\text{Surface Area}}{6}$

$\text{side length}=\sqrt{\frac{\text{Surface Area}}{6}}$

Substitute in the given surface area to find the side length.

$\text{side length}=\sqrt{\frac{96}{6}}$

Simplify.

$\text{side length}=\sqrt{16}$

Reduce.

$\text{side length}=4$

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

$V = 2^{3}, ft^3 = 8, ft^3$

A rectangular prism with a square base is cut out of a cube as shown by the figure below.

Find the volume of the figure.

Explanation

Start by finding the volume of the cube.

$\text{Volume of Cube}=\text{edge}^3$

$\text{Volume of Cube}=13^3=2197$

Next, find the volume of the rectangular prism.

$\text{Volume of Rectangular Prism}=\text{width}\times\text{length}\times\text{height}$

$\text{Volume of Rectangular Prism}=2 \times 2 \times 13=52$

Subtract the volume of the rectangular prism from that of the cube to find the volume of the figure.

$\text{Volume of Figure}=\text{Volume of Cube}-\text{Volume of Rectangular Prism}$

$\text{Volume of Figure}=2197- 52=2145$

Find the diagonal of a cube with a side length of .

$diagonal=\sqrt{3}$

$diagonal=\sqrt{2}$

$diagonal=2\sqrt{3}$

$diagonal=\sqrt{6}$

$diagonal=2\sqrt{2}$

Explanation

The diagonal of a cube is simply given by:

$diagonal=x\cdot \sqrt{3}$

Where is the side length of the cube.

So since our

$diagonal =1\cdot\sqrt{3}$

$diagonal=\sqrt{3}$

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