Creo Interactive Surface Design (Style) > Curves > Editing Curves > To Adjust the Tangents for Closed Curves
  
To Adjust the Tangents for Closed Curves
1. In the Model Tree, right-click the Style feature that contains the closed curve, and choose Edit Definition. The Style tab opens.
2. Select the closed curve.
3. Click Style > Curve Edit. The Curve Edit tab opens.
4. Select the close point . The leader tangent and the follower tangent vectors are displayed, and the start of the curve and the leader tangent are activated.
 
* There is no tangency control on the endpoints of periodic curves.
5. To modify the leader tangent, select its vector and define the attributes, or modify its parameters on the Tangent tab.
6. To select the end point and the follower tangent, select the close point again, right-click, and choose Select End Point from the shortcut menu. The follower tangent is activated.
7. To modify the follower tangent, select its vector and define the attributes, or modify its parameters on the Tangent tab.
8. Click .