SQL Server/T-SQL Tutorial/Math Functions/DEGREES
DEGREES converts a float value, which represents an angle in radians, into the value of this angle in degrees.
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4> 5> SELECT DEGREES(PI()/4) 6> GO
45
(1 rows affected) 1> SELECT DEGREES(ACOS(0.5)) 2> GO
60.000000000000007
(1 rows affected)</source>