actually it is about the Geometry.
in the attached photo, i know the W and length of inner and outer arc. i need to know the values of "r" and "R" and "a" angle. does anyone has any suggestion?
With only known W, inner and outer arcs, the sketch is still floating. You need angle to fully constrained the sketch
With all the known dim, you can find out r and R by adding them as driven dim
Ctrl select the end points of the arc & then the arc itself, to dimension the length. Add the dimension for W & you can then get all the info you need with driven dimensions. As Christian mentioned the sketch won't be fully defined until the cutout position is defined. In my case one of the edges has a Horizontal relation & are Coincident with the centre.
Horizontal relation removed:
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