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In the Grids task, create grids as needed for drawing the trench path.
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In the Civil task, click Place Trench Command .
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Click Path on the Place Trench Ribbon, and then place two straight segments of equal length at an angle.
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Click Edit on the Create Path Ribbon, and then click the sketch point at the miter location.
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Select Bend from the Turn Type list.
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In the Value box, type a radius for the curve segment. The curve segment radius must be equal to the adjacent segment length.
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Click Finish to create the curve feature. An example is shown below.
1 - Curve feature