To Create an Arc Using 3-Point/Tangent End
Create an arc from 3 points or an arc tangent to the end of an entity.
Create an arc from 3 points
Watch a video of creating a 3-point arc.
1. Click the arrow next to Arc.
2. Click 
3-Point / Tangent End.
3-Point / Tangent End.3. Click to place the first end point of the arc.
4. Move the pointer and click again to place the second point for the arc.
5. Move the pointer back towards the first point and up or down to determine the radius of the arc, click the third point to set the radius of the arc.
Create an arc tangent to the end of an entity
Watch a video of creating an arc tangent to the end of an entity.
1. Click the arrow next to Arc.
2. Click 3-Point / Tangent End.
3-Point / Tangent End.3. Click the end point of a line or a point on an entity.
4. Move the pointer to see the tangent constraint icon 
. When the icon is visible, the arc is tangent to the selected entity.
. When the icon is visible, the arc is tangent to the selected entity.5. Click again to place the second point of the arc.