GeoGebra
GeoGebra has two tools that can be used to draw spheres in 3D-space:
-
If you want to draw an arbitrary sphere, choose Item 4.
-
If you know the radius and center of your sphere, choose Item 4.
GeoGebra Instruction 1
Drawing a Sphere Using the Sphere: Center & Point Tool
- 1.
- Open
Algebra Viewand3D Graphicsunder
Viewin
Menu. - 2.
- Click on the
Sphere: Center & Point
tool. - 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 towards or away from the center.
GeoGebra Instruction 2
Drawing a Sphere Using the Sphere: Center & Radius Tool
- 1.
- Open
Algebra Viewand3D Graphicsunder Viewin Menu. - 2.
- Click on the
Sphere: Center & Radius
tool. - 3.
- Click on a desired point inside of
3D Graphics. This point will be the center of the sphere. - 4.
-
GeoGebrawill now ask you to type in the radius of the sphere. Type in the desired radius. The sphere will then appear in3D Graphics.
Alternatively, you can type
Sphere(Point, Radius)
in Algebra View, inputting the coordinates of the center of the sphere in the Point field, and the radius of the sphere in the Radius field.
Example 1
Draw a sphere with its center at (1, 3, 2) and a radius of 2.
Follow Item 4 for this exercise. Type
Sphere(Point, Radius)
in Algebra View. Then type the relevant values into the fields where they belong. The sphere will now appear in 3D Graphics.
