Sketcher > Dimensioning Sketcher Geometry > Working with Dimension Tools > Normal Dimensions > Dimensioning Conics > To Dimension a Conic Arc Defined by Three, Four, or Five Points
  
To Dimension a Conic Arc Defined by Three, Four, or Five Points
1. Create a Conic Arc.
2. Create up to three Sketcher points to which to anchor the conic arc.
3. Click Sketch > Coincident.
4. Select the conic arc and a point. The conic arc aligns to the point.
5. Repeat for each of the other points to which to anchor the conic arc.