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Concept > Surfaces From Sketches.
Set the Base Object to Sketch 1 (located underneath XYPlane in the Tree). Click Generate
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!
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Go to Step 3: Mesh
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