Learn how to use the Tangent command to constrain a curve and another object in a sketch so that they touch at a single point but never cross each other in Fusion.
Click Sketch > Constraints > Tangent .
The Tangent constraint icon displays next to the cursor in the canvas.
In the canvas, select the sketch geometry you want to constrain.
The sketch geometry snaps to maintain a tangent connection. A constraint badge displays next to the constrained geometry in the canvas, indicating that the geometry is constrained to remain tangent to each other.