Understand Parabolas to Help Draw Vases Animation of Parabola Design

Parabola Animation
Wikipedia Parabola Animation

When my students are drawing bowls, vases, glasses, cups, jars, etc., they invariably have difficulty making the sides match.  I tell them to draw a straight line through the center and to try to copy on one side what happened on the other.  This diagram is excellent to help explain the mathematics of what is happening.

Why Bowls and Vases

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