Are in synthetic geometry problems negative angles allowed? In many of them I needed to calculate something like 90°-A but A could be greater than 90°. Also the triangle natured is not specified. I have seen that the original solutions use a general way but are calculations with negative angles allowed ass well? It kinda makes sense for me thinking that if A>90° then if BB' is a height then B'CA is 90°-A=-(A-90°) so it goes in the exterior. This may seem usual but I haven't really cared about it.
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