In the interactive figure, enter the coordinates for point A (the center of the sphere) and point B (on the surface of the sphere). Observe how the equation of the sphere changes.[br][br]You can drag points A and B. Notice that when you hover over a point, arrows appear showing you how the point will move. Click on the point without dragging to change how the point moves.

[i]Developed for use with Thomas' Calculus, published by Pearson.[/i]