The
Tangent to a point![](../isodraw_top_toc/images/BtnTangentEP.png)
tool resolves the opposite situation: the ellipse is available but not the lines. Select the function from the toolbox. The cursor becomes an arrow tip (ellipse)
![](../isodraw_top_toc/images/C-Tangente.png)
cursor. Click the required ellipse and drag the tangent towards the end point.