The following instructions indicate how to place a surface on your 3D-Kit.

Example: Find the surface represented by the formula z = x² + y² and place it on your 3D-Kit, find the points that satisfy the equation for the surface:

1. Find various points that satisfy the surface, for example (0, 2, 4), (1, 1, 2), (2, 1, 5), and (-1, 2, 5) and place them on your kit.
   
   Figure 15
   
   
   
   
2. Bend the surface in your kit to assume the necessary form to pass through the indicated points.
   
   
   
   
3. Place the surface on the magnetic tips as shown in Figure 16. (Note, only the mesh part of the surface is magnetic.)
   
   Figure 16