Construction graphics are available on Home Tab, Space Management Tab, Piping Tab, and Structural Tab.
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Select Place Construction Arc by 3 Points
.The first point glyph displays next to the cursor.
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Select in the model to define the first point of the arc.
The distance from the first point displays as a dashed line, and the second point glyph displays next to the cursor.
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Select in the model to define the second point of the arc.
Both distances display as dashed lines. The arc stretches from the first and second points to the cursor, and the third point glyph displays next to the cursor.
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Select in the model to define the 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) 
.