2D to 3D: What's Going On? (Part 2)

In the app below, the 2D figure you see on the left is the same as the 2D figure you see on the right. [br]You can move the LARGE POINTS around to create different 2D figures.
Move the points around and fully slide the slider to create a very simple geometric surface.
What surface did you create?
What geometric transformation(s) occurred in the app above? Describe.
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– Tim Brzezinski

Information: 2D to 3D: What's Going On? (Part 2)