Construction graphics are available on Home Tab, Space Management Tab, Piping Tab, and Structural Tab.
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Select Place Construction Circle 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 circle.
The distance between the first point and the second 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 circle.
The distances between the points display as dashed lines. The circle stretches from the 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 third point of the circle.
Smart 3Dx displays the circle.
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) 
.