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Carry Out Boolean: SurfSk2-SurfSk1

Create > Boolean.
First, set Operation to Subtract. Next, use the face selection filter to apply the outer circle surface body as the Target Body. Then, use the face selection filter to apply the inner circle surface body as the Tool Body

Create a Bisecting Line

Click on XYPlane in the tree and it should highlight blue. Then, click the new sketch button, . In the new sketch draw a line on the y axis that goes through both of the concentric circles. Make sure that it is coincident to the y axis. Then trim the line segments that lay inside of the inner circle and the line segments that lay outside of the outer circle. This, is carried out by using the Trim feature located in the Modify portion of Sketching.

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