2D to 3D: What's Going On? (Part 6)
In the app below, the 2D figure you see on the left is the same as the 2D figure you see on the right.
Can you position the points to create a surface consisting of 2 parts? Try to do so.
Can you position the points to create a surface consisting of 3 parts? Try to do so.
Which of the following 3D surfaces cannot be formed by rotating a 2D figure about a line?