# How to Make a Sphere in GeoGebra

`GeoGebra` has two tools that can be used to draw spheres in the 3D-space:

• If you want to draw an arbitrary sphere, choose Item 4.

• If you know the radius and center, choose Item 4.

`GeoGebra` Instruction 1

### DrawingaSphereUsingtheTool`Sphere: Center & Point`

1.
Open `Algebra View` and `3D Graphics` under  `View` in  `Menu`.
2.
Click on the tool `Sphere: Center & Point` .
3.
Click on a desired point in `3D Graphics`. This point will be the center of the sphere.
4.
Decide the size of the sphere by moving the cursor toward or away from the center.

`GeoGebra` Instruction 2

### DrawingaSphereUsingtheTool`Sphere: Center & Radius`

1.
Open `Algebra View` and `3D Graphics` under  `View` in  `Menu`.
2.
Click on the tool `Sphere: Center & Radius` .
3.
Click on a desired point in `3D Graphics`. This point will be the center of the sphere.
4.
`GeoGebra` will now ask you to type in the radius of the sphere. Type in the desired radius. The sphere will now appear in `3D Graphics`.

Alternatively, you can type

in `Algebra View` where you type in the center of the sphere in the `Point` field and the radius in the `Radius` field.

Example 1

Draw a sphere with center at (1, 3, 2) and a radius of 2

Follow Item 4 for this exercise. Type in

in `Algebra View`. Then type in the values in the fields where they belong. The sphere will now appear in `3D Graphics`.