1. Call the perpendicular lines creation mode of the Line command. The preview of resulting lines will appear. Their intersection point will follow the cursor.

2. Select a 2D node to be used as the intersection of the resulting lines. A node can be selected in one of the following ways.

•Move the cursor over an existing 2D node, using object snappings, and press or <Enter>. Two perpendicular lines passing through such node will be created. Positions of the lines will depend on the position of the node. A new node is not created in such case.

•Move the cursor over an intersection of existing construction lines, using object snappings, and press or <Enter>. A connected 2D node and two perpendicular lines passing through it will be created at the specified intersection. The position of the node will depend on positions of the existing lines; the position of the perpendicular lines will depend on the position of the node.

•Move the cursor over a characteristic point of a graphic line, using object snappings, and press or <Enter>. A connected 2D node and two perpendicular lines passing through it will be created at the specified point. The position of the node will depend the position of the specified point; the position of the perpendicular lines will depend on the position of the node.

After creating a pair of lines, the command stays in the perpendicular lines creation mode.