Direct/Indirect relation 

Is it correct to say that (technically) if a 45 degree shot (by elevation) reaches the longest distance, then a 30 degree (45-15) will reach the same distance as a 60 degree (45+15) shot?
If so, could the lower-than-45 shot be considered direct fire, and the higher-than-45 shot considered indirect fire? If so, I think this is a great explanation (or one way of viewing things).