Question

There are 2 towers that are each 10m high.  A rope that is 15m long is strung between the tops of the towers.  At its lowest point the rope sags 2.5m above the ground (see schematic diagram).  How far apart are the towers?
Steve
what is the shape of the rope?

straight lines?
parabola?
catenary?
Anonymous
12.5
vishnu
7.5m
Manu
0 meter
Dany
Zero