KATO code 83 unitrack help!?!?

[brando03]

I know this is kinda of a off question, and I know Kato has nothing to do with bachmann(but I plan to run my Bachmann locos on it).  I am looking at redoing my track layout and want to run 22" radius curves.  I have been looking at kato unitrack and am kinda confused as to if this is 22" radius or not?

http://www.modeltrainstuff.com/KATO-HO-Unitrack-21-5-8-Radius-Curve-22-5-De-p/kat-2210.htm

And also if I would need 8 or 6 pieces for a 180 on a 4x8 sheet(and will it fit?)

Please dont flame I am new to this again and havent done a layout since I was little with my Grandfather.

[brando03]

Thank you!!!