coordinates of a point

 From:  Tony77
8987.7 In reply to 8987.6 
Hi guys
sorry for the trouble but I have a problem, exceeded that of the coordinates of the points I need to measure the angles of the triangle that has the vertices with various heights in Z as you can see from the figure.
If I project on the plane C the figure can safely but I have noticed that I lose obviously the proportion of the triangle.
how can I measure the angles of the triangle with the vertices with the values of the different vertices?
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