why is TMath::Atan2(1,1) = 135 degrees?

From: Richard T. Jones (jonesrt@uconnvm.uconn.edu)
Date: Thu Nov 26 1998 - 18:15:36 MET 

ROOT users,

Can someone explain why TMath::Atan2() is something other than the
standard atan2() in degrees?  As it is, the function returns theta+90.
If this is intended, could it be named something other than Atan2?

thanks,
Richard Jones

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