Where Did the Plane Go?

In the app below, the one plane you see passes through the 3 points. Move the 3 points around a bit. Then answer the questions that follow.

Is it possible to get the plane to disappear? See if you can make this happen. If so, what causes the plane to disappear?

What else do you you notice?

What conclusions can we make about 3 points and the number of planes that pass through these 3 points? List below: