My method would actually be to draw a 2x8 board component and rotate it to the hip angle, place it at the corner then position vertically so the edges are the plane of the tops of the common rafters.
The common rafters pitch is described (in inches) X/12 where “X” is the vertical dimension that comes in 12" horizontal. The hip rafter is X/17, so if you simply rotate a common rafter it is too steep for the hip.
If the common or nominal roof pitch is say 5/12 the hip will be 5/17.
To illustrate you can align the hip by placing common rafters out each side of the corner --starting same distance from the corner, each side. the interections will give the angle of the hip. Or you can use the protractor to create a guide at your hip pitch. A simple shape of the roof also gives an edge with the hip pitch.
The hip birdsmouth is also adjusted (hip rafter moved vertically) so that the line of the hip is in the plane of the two sides.
FYI the roof pitch can be entered using the protractor or the rotate tools by typing "X:12"
