Use measure tool
OR start a new sketch and using convert entities, get the edge and draw an arc onto that to match the radius.
click dimension and select the arc, the dimension is displayd and stays vissible in the screen
of if you have sw professional you can try to use feature works
no its a dumb solid. you will have to use the measure function in SW. or make a drawing and snap your own dims to it.
try the sat export from Catia, iges isn't the best anymore into SW. does your seat of Catia have parasolids? which is the best into SW.