You can transition from sketching a line to sketching a tangent arc, and vice versa, without selecting the arc tool.
To autotransition between line and arc:
- Click Line (Sketch toolbar) or click and sketch a line.
- Click the endpoint of the line, then move the pointer away.
The preview shows another line.
- Move the pointer back to the endpoint, then away again.
The preview shows a tangent arc.
- Click to place the arc.
- Move the pointer away from the arc endpoint.
The preview shows a line. You can draw a line or change to an arc as in Step 3.
To toggle between line and arc without returning to the endpoint, press A.