Trying to remodel a basement.. Math question I need answered though!!?

So my mother and I are trying to redo a basement and we thought it would be fun to close off part of the basement with shower curtains. Well here is my dilemma: The width of the area we want to close off is 13ft. we found crescent shaped shower curtains on the website listed below but they are for a 5ft. bath so if we bought 3 crescent shaped rods that would be 15ft am I right or does it change the length since there is a crescent shape in the rods? Help please! How many rods do i need and will 3 rods fit? I need to understand the math!?...Confused...
Here is the website for details/measurements: www.lnt.com/product/index.jsp?...

Answers:
Yes that would be 15 ft, because they are made for a 5 foot tub. So the actual length of the rod if it was bent straight would be a little longer than 5 feet. You may find that when you try hooking the rods together that it bends more than you anticipated.

Other answers:
they fit a 5 ft tub so the distance from one end to the other is five ft. yes if you straiten it out it would be longer
they fit a 5 ft tub so the distance from one end to the other is five ft. yes if you straiten it out it would be longer
SIDE NOTE:
These crescent type rods tend to be a bit straight at the ends... so I don't know how well joining them together would be.
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