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The command Arc is used to draw an arc by 3 points.
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Click Draw.
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Click Arc.
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You can select to draw an arc by 3 points in 3D or horizontal (the elevation is the elevation of the first point).
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On the graphic area click to create the three points and define the arc.
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First point indicates the beginning of the arc.
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Second point is a point on the circumference.
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Third point is the end of the arc.
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