Sketching an Ellipse in Sheet Metal
- Select the Sheet Metal tab.
- Click  Ellipse in the Sketch
                        group. Ellipse in the Sketch
                        group.
- (Optional) Click the Profile option if you want to create walls as you sketch.
- Click to set the center of the ellipse.You can dimension the points relative to other sketch objects. 
- Click to set the overall length and angular orientation of the first axis.
- Click to set the length of the second axis.