Remove the ribbon by sliding the green point: Thanks to Walter Whiteley for creating the sketch.
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A ribbon that is wrapped around a box can be removed with
out cutting, stretching, or untying it. Try
to do so with an actual ribbon on a box.
Then
model this situation geometrically and explain why it works. It
may be easier to explain first with a rectangle.
Remove the ribbon by sliding the green point: Thanks to Walter Whiteley for creating the sketch. |
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RibbonSlide2