Autodesk AUTOSKETCH 8, Руководство пользователя

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Drawing a Line in Relation to an Entity
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To draw a line perpendicular to an existing entity
1 On the Draw menu, click Line, Perpendicular, or click the Perpendicular
Line button on the All-In-One toolbar.
2 Click a line, arc, circle, polyline segment, or polygon segment in the
drawing. A perpendicular rubber-band line appears, following the pointer.
3 Click an endpoint.
AutoSketch also allows you to draw a line at a specific angle from the end-
point of an existing line. The new line starts at the endpoint nearest the
point you clicked and extends in one of four directions at the angle you
specify on the edit bar. The second point defines the direction and length of
the line.
To draw a line at a specific angle to an existing line
1 On the Draw menu, click Line, Angle, or click the Angle Line button on
the All-In-One toolbar.
2 Enter the offset angle in the Line Angle text box on the edit bar and press
ENTER. This angle should be positive and less than 90 degrees.