DAX doesn't have an ATAN2 function so I created one.
ATAN2 =
VAR __x = MAX('Table'[X])
VAR __y = MAX('Table'[Y])
VAR __atan2 =
SWITCH(
TRUE(),
__x > 0, ATAN(__y/__x),
__x < 0 && __y >= 0, ATAN(__y/__x) + PI(),
__x < 0 && __y < 0, ATAN(__y/__x) - PI(),
__x = 0 && __y > 0, PI()/2,
__x = 0 && __y < 0, PI()/2 * (0-1),
BLANK()
)
RETURN
__atan2
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