FlightPathOBN:
BTW...a 4.3r to a 5.2r is a busted curve....this must not fly very well...
Those are distances along the RF legs, not radii. Radii are not shown on the chart. They are on source and usually shown in the FMS legs page.
Source shows the radius for each of those legs to be 3.70 miles:
http://avn.faa.gov/acifp/ndbr/00380R..._ORIG_NDBR.pdf