-The position of each point can be defined by \b Absolute coordinates X, Y, Z or
-by \b Relative coordinates DX, DY, DZ with respect to the previous Applied point.
-The type of coordinates can be selected by the <b>Coordinates Type</b>
-radio buttons.
+By <b>Cartesian coordinates</b> , which can be either:
+- \b Absolute coordinates \b X, \b Y and \b Z, or
+- \b Relative coordinates \b DX, \b DY and \b DZ with respect to the previous applied point,
+
+By <b>Angular coordinates</b>, which include:
+- the \b Length of the segment and an \b Angle in the chosen plane (OXY for example) in \b Relative mode. The angle is then relative to a local coordinate system with the last point of the sketch as origin. </li>
+
+\image html 3dsketch_angle_rel.png
+
+- the \b Radius (i.e. the distance from the origin) and an \b Angle in the chosen plane in \b Absolute mode
+
+\image html 3dsketch_angle_abs.png