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Lets say we have two point A and B, then:
DX = (xB - xA)
DY = (yB - yA)
if DX>0 & DY>0 then:
Azimuth = ATAN(DX/DY),
but if DX > 0 & DY < 0 then:
Azimuth = 200-ATAN(DX/DY), where 200 is grads if your using grads or 180 degrees if you are using degrees, in general you should have in mind that the formula will be constructed according to the TAN which is tan(θ) = Opposite / Adjacent.
http://www.windowsphone.com/en-us/store/app/land-survey-tools/3d487...
Does this help?
dX = X2 - X1
dY = Y2 - Y1
Azimuth = ATAN(dX/dY)
Distance = SQRT(dX*dX + dY*dY)