Construction graphics are available on Home Tab, Space Management Tab, Piping Tab, and Structural Tab.
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Select Place Construction Arc by Center
.The center point glyph displays next to the cursor.
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Select in the model to define the center point of the arc.
The radius of the arc displays as a dashed line, and the first point glyph displays next to the cursor.
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Select in the model to define the first end point of the arc.
A second radius displays as a dashed line. The arc stretches from the first end point to the cursor, and the second point glyph displays next to the cursor.
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Select in the model to define the second end point of the arc.
Smart 3Dx displays the arc.
While the command is active, you can press BACKSPACE to undo the last point that
you placed. After you place the final point, use Undo (CTRL + Z) 
or Delete (DELETE) 
.