Join our CAD community forums where over 25,000 users interact to solve day to day problems and share ideas. We encourage you to visit, invite you to participate and look forward to your input and opinions. Acrobat 3D, AutoCAD, Catia, Inventor, IronCAD, Creo, Pro/ENGINEER, Solid Edge, SolidWorks, and others.
The three 24 distance dimensions define the slanted sides of the 3 legs, with each side being tangent to the R9.5 outer circle and 24 mm from the center. (I think each 24 dimension should include "2 places")
(A easy way to draw the 6 slanted lines: 1. draw the R9.5 circles, 2. draw a R24 circle in the center (construction mode), 3. add lines tangent between the circles, and 4. trim lines and circles)
Once you get the outside profile drawn and constrained (green), use the Offset command to draw the inside profiles of the pockets.