Arc Tangent to a Line To create an arc by tangent: 1. Click the Arc tool from the Basic palette. 2. Click the Arc Tangent to a Line mode button. 3. Click to set the start point of the arc. 4. Click to define the line to which the arc will be tangent. Move the mouse until the desired arc orientation and size is previewed. 5. Click to set the end point of the arc.