> >     If you have 2 20' poles, a 32' rope strung between them, and
> the
> > lowest point of the rope is 4' off of the ground, how far
> apart are
> > the poles?
> > 


If I understand correctly, I think the answer to this one is 16'.

If the rope is attached to the ends of the poles, then the drop of the rope
is 20' - 4' = 16'.

The rope has total length of 32', the total length is composed of a drop and
a horizontal span. So even though the shape of the rope is a parabola, we
can just subtract the drop from the total length to get the span.

Alex


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