Click this icon to insert an arc tangent to a single entity. This tool requires you to have one arc, chamfer, circle or line already drawn to refer to.
1. Turn off your constraints.
2. If you know the radius of the arc you wish to draw, enter it in the modifier.
3. Click on the entity you wish the arc to be tangent to.
4. Select the first location and click the left mouse button. This location anchors the origin and the radius of the dynamic circle. A dynamic line from the origin of the circle to the current cursor position is displayed. The starting angle is at the intersection of the circle and the line.
5. Select the second location and click the left mouse button. This location specifies the starting angle of the arc. A dynamic arc is displayed with the desired starting angle. Again, a dynamic line is displayed from the origin of the arc to the current cursor position. The ending angle is at the intersection of the arc and this line.
6. Specify the ending angle, and create the arc by selecting the third location.
As with all the arc tools, the radius will be drawn in a counter‐clockwise direction. In some cases, you may need to start with your second location first.