You can sketch a line on the top plan of your part from inner cylinder to the next wall, then use rib tool to create one rib, adjust thickness, draft if required, repeat rib function to obtain the others. While hoping this willhelp.
i agree wid u ..the thickness is 5mm
I have tried to estimate angle values of the two series of ribs. Contrstruction is the same way as before. Rollback feature manager and arrange angle values and other parameters to your convenience. Regards.
AttachmentsRibbed Part2.SLDPRT, 471 KB
Here is ribbed part in SW2014
AttachmentsRibbed Part1.SLDPRT, 380 KB
i hope this helps
Answered with a tutorial: https://grabcad.com/tutorials/rib-angle-in-solidworks--1
Attachmentsre.SLDPRT, 473 KB
Gurudath: great professor