Explanation:
the outer angle (46°) is half of the difference between the outer arc angle and the inner arc angle at A.
the inner arc angle is x.
the outer arc angle is therefore 360 - x.
so,
46 = ½((360 - x) - x) = ½(360 - 2x) = 180 - x
x = 180 - 46 = 134°