# Special Spheroid Action: Locus Illustration

- Author:
- Tim Brzezinski

- Topic:
- Ellipse, Rotation, Solids or 3D Shapes

The following applet illustrates a , for the case where .
The white points are foci, the

**spheroid (ellipsoid of revolution)**with equation**orange points are vertices**, and the**yellow point is any point**on this**ellipsoid of revolution.****(Feel free to drag this yellow point anywhere you'd like!)**How does the action you see here compare with the action seen here?**To explore this resource in Augmented Reality, see the directions below the Milano cookies (at the bottom of this page).**And just for the fun of it.....
Doesn't this ellipsoid of revolution (below to the left) look a lot like Pepperidge Farm's Milano cookie (right)?

## TO EXPLORE IN AUGMENTED REALITY:

1) Open up GeoGebra 3D app on your device.
2) Click on the 3 horizontal bars (upper left). Select OPEN.
3) Type in the code

**hVtDzf4D**. (It IS case sensitive). Note this string of characters = the last 8 digits of the URL for this resource. 4) The**Animate**slider does the animation. The**MajorAxis**and**MinorAxis sliders**alter the spheroid itself (obviously). The**Filling**slider alters the opacity of the spheroid itself.