the angle is the sum of alphabetical positions of each letter minus 2..

w= 23rd alphabet

x=24

i=9

add all positions we get 56

56-2 is the angle in degrees.

so for ixm= 9+24+13=46 -2= 44

mxs= 13+24+19=56-2 = 54

sxw= 19+24+23=66-2= 64