Angle measurement

I am using the Measure tool to measure a sharpe angle between to surfaces, such as below picture shown, I thought the measurement result should be 60 degrees, but it turns out that the result is 120 degrees, I understand that the result Creo measured are from two perpendicular surfaces instead of the surfaces I measured, I can get the 60 degrees esult I want from some calculation, but it really annoying some times, especially if I need to take some picture to shown the measurement result to other people, every time I had to explain about this, I'd rather it give me a 300 degrees result, so that I can tell people that I am measuring the an obtuse angle between the two surfaces,   anyone can help on this? Thanks very much.