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Building a cardboard box

You are given a rectanglar piece of cardboard and you wish to make an open top box. You cut out the corners and draw dotted lines. Use this applet to explore how the volume of the box varies as a function of its height. What are the similarity and differences to the applet entitled rain gutter on the mathMINDhabits website? What questions could / would you put to your students based on this applet?
The addition of this applet to the collection was prompted by a discussion in E330.