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So my problem is that I have start point [lat,long] for arch, bearing, radius and I need compute end point [lat,long] ? End point should be in 180 degrees angle from start point and I should be aware of curvature of the earth ... So let say I have start point [54.01,104.05], bearing is 170 and radius is 2 km ... Any ideas?

Thanks in advance.

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Is this a circular arc? Anyway, since you say the endpoint is at a 180° bearing, doesn't your problem simplify to a linear distance addition/conversion (lat+2*R)? –  lynxlynxlynx Feb 4 '13 at 21:58
The goto function in the code at gis.stackexchange.com/a/31401 shows how this can be calculated for a spherical datum. However, for a 2 Km arc you don't need to worry about the earth's curvature! –  whuber Feb 4 '13 at 22:32

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