In this dialog box, the coordinates of the ends of the curves can be specified in different ways.
Start point
Specify the coordinates of the point where the curve begins.
 X

Specify the horizontal position.
 Y

Specify the vertical position.
End point
Specify the coordinates of the point in the drawing where the curve ends. The coordinates of the second end of the curve can be specified as follows:
 In absolute coordinates

Specify the horizontal position in the X box and the vertical position in the Y box.
 In coordinates relative to the starting point

Specify the distance of the endpoint from the starting point in the fields Dx and Dy.
 In polar coordinates from the starting point

Specify the length of the segment and the angle it forms with respect to the xaxis in the fields Segment length and Angle.
Style
Select the curve style from the proposed list or create a new style.