The Snap to Tangent option uses the SmartCursor to locate tangents on circular arc geometry when drawing.
Tangents cannot be found on quarter arcs.
To activate tangent snapping:
Click the Snap to Tangent tool from the Snapping palette. No parameters are required.
Hold down the Option (Mac) or Alt (Windows) key to switch the tangent to the opposite side of the object.
Click here for a video tip about this topic (internet access required).
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